In the early 1990s, a group of children—for themselves and “generations yet unborn”—sued the Philippine Government. They wanted to cancel all existing timber license agreements (TLA) in the country. Their legal theory goes: deforestation, if not abated, will rob the plaintiffs’ generation of their right to a clean and healthy environment.

The children won in the Supreme Court. And it was a landmark decision. The Supreme Court in Oposa v. Factoran enunciated the doctrine of intergenerational equity. In granting the children legal standing to bring in the suit, the Court explained:

[E]very generation has a responsibility to the next to preserve that rhythm and harmony for the full enjoyment of a balanced and healthful ecology. Put a little differently, the minors’ assertion of their right to a sound environment constitutes, at the same time, the performance of their obligation to ensure the protection of that right for the generations to come.

Three decades later, environmental litigants remain locked in a procedural tug-of-war. On one side sits the traditional notion of legal standing, which requires a direct, personal injury. On the other is the Supreme Court’s procedural innovation—beginning with Oposa later codified in the Rules of Procedure for Environmental Cases (RPEC)—which permits citizen suits to enforce environmental rights on behalf of others.

This shift, however, creates a fundamental friction with constitutional mandates. While the Constitution requires “actual controversies” for judicial intervention, citizen suits often involve plaintiffs suing on behalf of future generations based on anticipated, rather than immediate, damage. Successfully litigating these cases requires extraordinary foresight to define both the impending harm and the specific reliefs that future generations might require. Unfortunately, many environmental cases reaching the Supreme Court have fallen short of this high bar, failing to provide the clarity necessary to protect the interests of those yet unborn.

This Note will discuss the concepts of legal standing in Philippine remedial law—real party in interest, locus standi, and a citizen suit—in the context of environmental litigation. Thereafter, the author will expound on the necessity of a liberalized approach in the context of environmental litigation. Moreover, the Note will discuss the dangers of an overly liberal standing. Part IV of the Note will attempt to enunciate possible areas of reform, including a defense of the Oposa doctrine.

I

The Constitution grants the courts the power to “settle actual controversies.”5 The core component of legal standing is an essential and unchanging part of the actual controversy requirement in the constitution. Thus, to trigger the court’s jurisdiction, a plaintiff must have standing to bring in the suit.

A

Under a traditional lens, legal standing refers to being a real party in interest. A real party in interest is the party who stands to be benefited or injured by the judgment in the suit, or the party entitled to the avails of the suit. A “party” is one who is to be benefited or injured by a judgment or order of a court. “Interest” means material interest, an interest in issue and to be affected by the decree, as distinguished from mere interest or curiosity in the question involved, or a mere incidental interest. Thus, one having no right or interest to protect cannot invoke the jurisdiction of the court as a party-plaintiff in an action.

Failure to bring the action against the name of the real party in interest may result in the dismissal of the action, if timely raised by the defendant, for failure to state a cause of action. The converse can be said. Failure of the real party in interest to file the action also makes the case dismissible on the grounds of failure to state a cause of action. Thus, in a civil action, the plaintiff must be the real party in interest, and the action must be prosecuted in the name of the real party in interest. Moreover, there is a necessity of limiting parties in a civil action between and among real parties in interest:

Necessarily, the purposes of [Rule 3, Section 1 of the Rules on Civil Procedure] are 1) to prevent the prosecution of actions by persons without any right or title to or interest in the case; 2) to require that the actual party entitled to legal relief be the one to prosecute the action; 3) to avoid a multiplicity of suits; and 4) to discourage litigation and keep it within certain bounds, pursuant to sound public policy.

The doctrine on real party in interest is grounded on public policy. Such a rule is intended to bring before the court the party rightfully interested in the litigation so that only actual controversies will be presented and the judgment will be binding and conclusive and the defendant will be saved from further harassment and vexation. It is an imperative because only the real party in interest plaintiff can assert a legal right (rights-bearer), while the real party in interest defendant is one who has a correlative legal obligation whose act or omission violates the legal right of the former (rights-holder).

B

Philippine case law also provides for the concept of legal standing in constitutional litigation. In such cases, the party-plaintiff (petitioner) is suing the government, with the end goal of striking down the assailed governmental act.

Legal standing or locus standi has been defined as a “personal and substantial interest in a case such that the party has sustained or will sustain direct injury as a result of the governmental act that is being challenged.” Locus standi is but one of the four requisites required to be shown to invoke the courts’ expanded power of judicial review, that is, to determine whether or not the government has committed grave abuse of discretion amounting to lack or excess of jurisdiction. Locus standi is an irreducible minimum condition that will trigger the court’s exercise of judicial power. Jurisprudence has adopted the tests of “material interest” and “direct injury” in determining whether the petitioner has locus standi. The stringent requirement is there to prevent just about any person from seeking judicial interference in any official policy or act with which he disagreed with, and thus hinders the activities of agencies engaged in public service. Nevertheless, the Court has discretion to liberalize the doctrine of locus standi:

In any event, the Court may allow suits even if the petitioner fails to show direct injury as the rule on standing is a matter of procedure which can be relaxed when public interest so requires, such as when the matter is of transcendental importance, overarching significance to society, or paramount public interest. This is the nontraditional or liberal mode of standing.

Under this mode, nontraditional litigants may be accorded standing to sue by the Court, provided the following requisites are present: first, for taxpayers, a claim of illegal disbursement of public funds or that the tax measure is unconstitutional; second, for voters, a showing of obvious interest in the validity of the election law in question; third, for concerned citizens, a showing that the issues raised are of transcendental importance which must be settled early; and finally, for legislators, a claim that the official action complained of infringes their prerogatives as legislators.

II

Citizen suits allow for a unique type of standing. The innovation of a citizen suit was brought in large part because of the difficulty of satisfying the strict requirements of a real party in interest in environmental litigation. As a result, environmental cases have been dismissed for failure of the plaintiff to show that he would directly suffer, or be affected by the case’s outcome.

Thus, following Oposa, the Clean Air Act allowed “any citizen” to file any appropriate civil, criminal, or administrative suit to enforce the law’s provisions. Citizen suits were also allowed under the Ecological Solid Waste Management Act. A similar provision was also included in the Tubbataha Reefs Natural Park Act, which was enacted a few weeks before the RPEC took effect. Citizen suit for environmental cases was finally codified under the RPEC in April 2010. The Court explained:

Citizen suit is one of the features introduced in the Rules of Procedure for Environmental Cases that seeks to liberalize the traditional rule on standing by relaxing the requirement of personal and direct interest for all cases filed to enforce environmental laws. This is intended to further encourage the protection of the environment as stewards of nature.

The Rationale to the RPEC reveals that the Court’s introduction of the citizen suit was grounded on the need for public participation in environmental enforcement: “If indeed the people have enforceable environmental rights, then the legal system must give the people a venue to protect these rights.”

The facts in Oposa reveal—nay, require—the need for a liberalized standing particular to environmental litigation. Testing the facts of Oposa against the traditional concept of a real party in interest would show that the plaintiffs had no cause of action against the government.

First, the plaintiffs failed the direct injury test; they could not point to a specific, present loss of private property or a distinct physical injury, but rather an anticipated ecological degradation that affected the country at large. Second, generations yet unborn do not possess civil personality. They are neither natural nor juridical persons who may be allowed to become a party in a civil case. Third, the interest they sought to enforce (deforestation) was not material in the sense that every Filipino could assert such a claim; it was a diffuse interest. In sum, Oposa would have been dead on arrival, had the Supreme Court not carved out the concept of citizen suit and intergenerational equity.

This is exactly the problem that citizen suits sought to remedy. The public, who has the right to a balanced and healthful ecology, need not wait for an actual or imminent environmental disaster to act. RPEC now allows the current generation to bring in a suit to preserve and protect the future generations’ environmental right.

III

Citizens suits concerning the environment have reached the Supreme Court. First of these was Arigo v. Swift, which involved a petition for a writ of kalikasan in relation to the grounding of USS Guardian over the Tubbataha Reefs. While the Court dismissed the petition on the merits, it nevertheless acknowledged the “liberalization of standing” enunciated under the RPEC. Liberalized standing would be consistently affirmed and applied in succeeding environmental cases.

A

There is a concurring opinion in Arigo worth noting. Justice Mario Victor M.V.F. Leonen agreed with the dismissal of the petition, but he will go as far as overruling Oposa’s doctrine of intergenerational equity.

The Leonen concurrence begins with categorizing a citizen suit as a representative suit. It correctly points out that one acting in a representative capacity does not make such a representative the real party in interest—he remains a stranger to the cause of action.

Furthermore, the Leonen concurrence finds the declaration of “minors and generations yet unborn” as real parties in interest (the doctrine of intergenerational equity in Oposa) problematic for three reasons:

  1. Representatives they run the risk of foreclosing arguments of others who are unable to take part in the suit, putting into question its representativeness.
  2. Varying interests may potentially result in arguments that are bordering on political issues, the resolutions of which do not fall upon this court.
  3. Automatically allowing a class or citizen’s suit on behalf of minors and generations yet unborn may result in the oversimplification of what may be a complex issue, especially in light of the impossibility of determining future generation’s true interests on the matter.

Finally, the Leonen concurrence proposes to limit the intergenerational equity in a limited number of environmental cases:

[T]he use of the Oposa doctrine in environmental cases should be allowed only when a) there is a clear legal basis for the representative suit; b) there are actual concerns based squarely upon an existing legal right; c) there is no possibility of any countervailing interests existing within the population represented or those that are yet to be born; and d) there is an absolute necessity for such standing because there is a threat of catastrophe so imminent that an immediate protective measure is necessary. Better still, in the light of its costs and risks, we abandon the precedent all together.

B

Prescinding from the Leonen concurrence, consider the following hypotheticals.

First, if the Oposa plaintiffs had lost their case on the merits, future generations may be barred by res judicata from suing for the cancelation of all TLAs in the country. The doctrine of res judicata means that there should be “an end to litigation by the same parties over a subject once fully and fairly adjudicated.” Unfortunately, if minors Oposa lost, and res judicata had set in, Oposa would have foreclosed any chance of litigating the same issue (i.e., cancelation of TLA vis-à-vis deforestation) in the future.

Second, the issue of being a political question was raised by the solicitor general. Indeed, this is where the Court struggled. While it declared the issue to be justiciable, the Supreme Court did not pass upon the merits of the case—it merely remanded the case back to the Regional Trial Court to rule on the propriety of canceling the TLA.

Third, the Oposa plaintiffs assumed that they were suing based on an interest that a Filipino minor from the 1990s and a Filipino in the year 2125 will have in common. For the Court, the averment was enough. After all, said the Court, “every generation has a responsibility for the next to preserve [the] rhythm and harmony for the fill enjoyment of a balanced and healthful ecology.” Unfortunately, such is, at most, a generalized and universal interest in ecology and the environment. A constitutional arrogance to impose what this generation wants for the minors and generations yet unborn.

This danger cannot be overemphasized in improperly handled environmental cases. Minors and generations yet unborn do not deserve to be bound by inadequate and unsubstantial suits brought by woefully unprepared “representatives.” Incompetence of the current generation must not tie the hands of minors and generations yet unborn.

IV

Environmental litigation is essentially a balancing of interests. After all, over 15 years have passed since the Court promulgated the RPEC. Hence, it may indeed be the time to revisit and retool the Oposa doctrine in an age where environmental litigation is becoming a norm.

This part of the Note will attempt to balance interest between providing a speedy and inexpensive remedy to enforce environmental rights, on the one hand, while upholding the public policy behind a “strict” real party in interest standard in civil suits. Thus, the following points are given, in the hopes of fostering a more rigorous environmental litigation.

A

To recapitulate, Rule 2, Section 5 of the RPEC provides:

SEC. 5. Citizen suit.—Any Filipino citizen in representation of others, including minors or generations yet unborn, may file an action to enforce rights or obligations under environmental laws. Upon the filing of a citizen suit, the court shall issue an order which shall contain a brief description of the cause of action and the reliefs prayed for, requiring all interested parties to manifest their interest to intervene in the case within fifteen (15) days from notice thereof. The plaintiff may publish the order once in a newspaper of a general circulation in the Philippines or furnish all affected barangays copies of said order.

Citizen suits filed under R.A. No. 8749 and R.A. No. 9003 shall be governed by their respective provisions.

1

The author proposes that the citizen suit be modified with a standing requirement that is more in harmony with a representative suit. Under the Rules of Civil Procedure:

SECTION 3. Representatives as Parties. — Where the action is allowed to be prosecuted or defended by a representative or someone acting in a fiduciary capacity, the beneficiary shall be included in the title of the case and shall be deemed to be the real party in interest.

A representative may be a trustee of an express trust, a guardian, an executor or administrator, or a party authorized by law or these Rules. An agent acting in his own name and for the benefit of an undisclosed principal may sue or be sued without joining the principal except when the contract involves things belonging to the principal.

A representative suit has two requisites: first, the suit is brought on behalf of an identified beneficiary whose right has been violated, resulting in some form of damage; and second, the representative is authorized by law or the Rules of Court to represent the beneficiary. Applied in environmental cases, the Supreme Court may consider the citizen suit as a species of representative suit. In citizen suits, the first requisite is satisfied, by virtue of the doctrine of intergenerational equity. However, the difficulty arises in satisfying the second requisite. Because generations yet unborn do not possess juridical capacity, they cannot authorize the representative in the suit.

Thus, for petitions for a writ of kalikasan filed as a citizen suit, it is submitted to include in the RPEC the necessity of a certification. The judge first must ascertain that the named plaintiffs truly represent a genuine ecological interest at stake and that the litigation is not being used for a narrow political or private agenda. The certification ensures that the named plaintiff acts—but not in a strict sense—“in a fiduciary capacity,” which is a hallmark of a representative suit. This certification may also accompany the order that the court issues after a citizen suit is filed. This quasi-fiduciary capacity is in accord with intergenerational equity, which posits that current generations hold the Earth “in trust for future generations.” The author believes that the courts are in the best position to certify the action—the judiciary being reposed with the rule-making power in protecting and enforcing constitutional rights.

In Environment Texas Citizen Lobby Inc. v. ExxonMobil, the United States Court of Appeals for the Fifth Circuit clarified that while environmental statutes allow “any citizen” to file an action, the plaintiffs must still meet the “irreducible constitutional minimum of standing.” Applied to the Philippine context, this suggests that the RPEC’s liberalization of standing should not be viewed as an abolition of the “actual controversies” requirement. Just because one is a Filipino citizen should not automatically entitle him to legal standing.

Without the proposed certification by the trial court, a citizen suit cannot proceed any further, and may be dismissed without prejudice for lack of subject matter jurisdiction. In other words, the certification is the condition precedent which confirms the plaintiff’s standing to sue. Without which, the court has no “actual controversies” to settle.

2

What then is the standard that judges must apply for certification of an action? This Note proposes that plaintiffs must, at least, demonstrate on the petition a prima facie threat of serious and irreversible environmental damage, so that he can point to some particularized interest or possible injury. It need not be the high standard of direct injury and material interest. By way of an example, a mere averment of being an environmental advocate is insufficient to clothe one with standing to file an environmental citizen suit. Beyond the pleadings, the court may also consider the track record of the petitioner (if they are a civil society organization) based on past jurisprudence or cases filed.

It is submitted, however, that where an environmental case is of extreme national importance, in such a manner that the threatened harm may affect the entirety of the archipelago, the Court may use the liberalized standing requirement in constitutional litigation. For instance, the courts may grant due course on the basis of “transcendental importance,” thus, dispensing with the more rigid requirement of material interest or direct injury.

Consistent with practice and procedure, if on its face, the petition for a writ of kalikasan shows a threat of serious and irreversible environmental damage and the need for an immediate protective measure, then, the court must certify the case and the issue the writ. Otherwise, the court may choose to decline certification and dismiss the action without prejudice. Ultimately, each suit must still be decided by the judge on a case-to-case basis in the exercise of his sound judicial discretion.

B

The doctrine of intergenerational equity must not be abandoned.

Viewed from the domestic plane, intergenerational equity implies that the current generation is a mere trustee of the environment, with the end goal of preserving it for the future generations.

From an international law point of view, intergenerational equity is but a tenet of the principle of sustainable development. Sustainable development evades a specific definition, but it recognizes the need to consider the needs of both current and future generations, and the role of equitable principles in the allocation of rights and obligations.

Intergenerational equity has appeared in the 1992 United Nations Framework Convention on Climate Change (UNFCCC), to which the Philippines is a party to:

The Parties should protect the climate system for the benefit of present and future generations of humankind, on the basis of equity and in accordance with their common but differentiated responsibilities and respective capabilities[.]

The Preamble of the Paris Agreement also recognized the principle in declaring that “climate change is a common concern of humankind, Parties should, when taking action to address climate change, respect, promote and consider their respective obligations on … intergenerational equity.” The Philippine Senate concurred in the Paris Agreement in 2017.

Some opine that the rights of future generations might be used to enhance the legal standing of members of the present generation to bring claims, in cases relying upon substantive rules of environmental treaties. This particular point is evident in the Philippines when the Commission on Human Rights noted that climate change “goes against the principle of intergenerational equity as it unfairly shifts burdens onto future generations.” Clearly, the doctrine remains a potent one, especially in cases where the immediate—but grave—effect of an event has yet to be determined with certainty.

More recently, principle of intergenerational equity was also recognized as a guiding principle in the July 2025 advisory opinion of the International Court of Justice (ICJ) in Obligations of States in Respect of Climate Change:

In the Court’s view, intergenerational equity is a manifestation of equity in the general sense and thus shares its legal significance as a guide for the interpretation of applicable rules. […] Due regard for the interests of future generations and the long-term implications of conduct are equitable considerations that need to be taken into account where States contemplate, decide on and implement policies and measures in fulfilment of their obligations under the relevant treaties and customary international law.

Notably, the Philippines’s written replies and comment to the ICJ’s questions in the aforesaid case seem to show the Government’s push to elevate intergenerational equity as a customary international law and a general principle of law which can be a source greenhouse gas emissions-related obligations of States. This statement is important, because if indeed the principle is already part of customary international law, then, intergenerational equity is already part of the law of the land ipso jure. In any case, by adopting such a standard, the Philippines ensures its procedural innovations are in lockstep with the ICJ’s view that intergenerational equity must serve as a manifestation of equity in the general sense, guiding the interpretation of applicable rules.

From the foregoing, it is submitted that instead of abandoning the doctrine altogether, the Supreme Court may consider strengthening it. The Court can do this by ensuring that the representatives (i.e., current generation) are the proper parties to an environmental suit. The courts must disallow parties who show mere curiosity, or present a generalized list of grievances against an activity. At the very least, plaintiffs must demonstrate a material interest on the resolution of the issue. Otherwise, they lack standing to sue as a representative of generations yet unborn. In such cases, it may be prudent for the courts to drop the minors and generations yet unborn as party-plaintiffs.

C

Environmental advocates and public interest litigators may consider thinking beyond the confines of the RPEC. In Sanggacala v. National Power Corporation, the Supreme Court introduced the concept of an environmental tort, a hybrid of tort law and environmental law. Tort law is a remedy to environmental harm, where such harm is to a “well-defined area or specific person or class of persons, is readily supported by general and specific causation, and closely fits the traditional elements of a tort cause of action.”

Thus, in environmental harm where there is specificity as to the affected persons or areas, the act or omission complained of, the effect or harm, and the causality between the act or omission and the harm, then, an action for damages based on environmental tort may be a better remedy than those afforded under the RPEC. Environmental tort converts the environmental harm as a cause of action—an actionable injury under the Civil Code and the Rules of Civil Procedure.

D

In sum, this Note recommends retooling the citizen suit into a species of representative suit and introducing a mandatory judicial certification process to verify the existence of actual controversies and ensure that plaintiffs represent a genuine ecological interest rather than a generalized grievance. While the doctrine of intergenerational equity should be preserved as a potent interpretive anchor—consistent with the UNFCCC and recent ICJ jurisprudence— it must be applied with greater procedural discipline. The courts must consider dropping “generations yet unborn” as co-plaintiffs when the current generation already possesses traditional standing to prevent the oversimplification of complex legal interests. Finally, for instances of specific, identifiable harm, plaintiffs should look beyond the extraordinary writs of the RPEC and embrace the environmental tort framework, which effectively converts ecological damage into an actionable civil injury.

V

Environmental litigation in the Philippines for the past three decades have reached highs and lows. Beginning with Oposa, the country led the world in decreeing that all citizens have the right to go to court to enforce environmental rights and obligations by themselves and generations yet unborn. The environmentalist trend of the judiciary went on and culminated with the promulgation of the RPEC in 2010.

Unfortunately, some environmental cases have reached the Supreme Court which, while rooted in good intentions and a fervent desire to protect the environment, have fallen short of the rigors required in litigation.

The dangers of foreclosing remedies for the future generations cannot be underscored enough. Thus, it is an imperative that the Court tweaks the existing framework for citizen suit under the RPEC. Shifting the citizen suit as a type of a representative suit may be a step in the right direction. Under such a framework, the courts will ensure that plaintiffs have a standing to sue. In this way, the courts can more meaningfully preserve and protect the citizens’ right to a balanced and healthful ecology.

This is, of course, by no means an indignation of the civil societies and counsels who filed suits only to enforce their environmental rights. However, if we are to truly become good stewards of Earth, we must ensure that our passion for the environment is matched by a commitment to the precision of the law.

Communities burdened with a threatened environmental harm often resort to willing advocates. These communities place their trust in lawyers who, in turn, are expected to perform their duties with utmost diligence and competence. At the end of the day, intergenerational equity does not only mean taking care of our planet now for a future generation. It also means being diligent architects of the legal frameworks that will protect them.

This Note was submitted as the midterms requirement for the Environmental and Natural Resources Law class under Atty. Gregorio Rafael P. Bueta. Citations and footnotes were omitted in this version.

Updated: