the non-impairment clause must yield to the police power of the state.

Felipe Ysmael, Jr. & Co., Inc. vs. Deputy Executive Secretary: 26

. . . Timber licenses, permits and license agreements are the principal instruments by which the State regulates the utilization and disposition of forest resources to the end that public welfare is promoted. And it can hardly be gainsaid that they merely evidence a privilege granted by the State to qualified entities, and do not vest in the latter a permanent or irrevocable right to the particular concession area and the forest products therein. They may be validly amended, modified, replaced or rescinded by the Chief Executive when national interests so require. Thus, they are not deemed contracts within the purview of the due process of law clause [See Sections 3(ee) and 20 of Pres. Decree No. 705, as amended. Also, Tan v. Director of Forestry, G.R. No. L-24548, October 27, 1983, 125 SCRA 302].

Since timber licenses are not contracts, the non-impairment clause, which reads:

Sec. 10. No law impairing, the obligation of contracts shall be passed. 27

cannot be invoked.

In a broader sense, this petition bears upon the right of Filipinos to a balanced and healthful ecology which the petitioners dramatically associate with the twin concepts of "inter-generational responsibility" and "inter-generational justice." Specifically, it touches on the issue of whether the said petitioners have a cause of action to "prevent the misappropriation or impairment" of Philippine rainforests and "arrest the unabated hemorrhage of the country's vital life support systems and continued rape of Mother Earth."

xxx

In the second place, even if it is to be assumed that the same are contracts, the instant case does not involve a law or even an executive issuance declaring the cancellation or modification of existing timber licenses. Hence, the non-impairment clause cannot as yet be invoked. Nevertheless, granting further that a law has actually been passed mandating cancellations or modifications, the same cannot still be stigmatized as a violation of the non-impairment clause. This is because by its very nature and purpose, such as law could have only been passed in the exercise of the police power of the state for the purpose of advancing the right of the people to a balanced and healthful ecology, promoting their health and enhancing the general welfare. In Abe vs. Foster Wheeler
Corp. 28 this Court stated:

The freedom of contract, under our system of government, is not meant to be absolute. The same is understood to be subject to reasonable legislative regulation aimed at the promotion of public health, moral, safety and welfare. In other words, the constitutional guaranty of non-impairment of obligations of contract is limited by the exercise of the police power of the State, in the interest of public health, safety, moral and general welfare.

The reason for this is emphatically set forth in Nebia vs. New York, 29 quoted in Philippine American Life Insurance Co. vs. Auditor General,30 to wit:

Under our form of government the use of property and the making of contracts are normally matters of private and not of public concern. The general rule is that both shall be free of governmental interference. But neither property rights nor contract rights are absolute; for government cannot exist if the citizen may at will use his property to the detriment of his fellows, or exercise his freedom of contract to work them harm. Equally fundamental with the private right is that of the public to regulate it in the common interest.

In short, the non-impairment clause must yield to the police power of the state. 31

EN BANC

G.R. No. 101083 July 30, 1993

JUAN ANTONIO, ANNA ROSARIO and JOSE ALFONSO, all surnamed OPOSA, minors, and represented by their parents ANTONIO and RIZALINA OPOSA, ROBERTA NICOLE SADIUA, minor, represented by her parents CALVIN and ROBERTA SADIUA, CARLO, AMANDA SALUD and PATRISHA, all surnamed FLORES, minors and represented by their parents ENRICO and NIDA FLORES, GIANINA DITA R. FORTUN, minor, represented by her parents SIGRID and DOLORES FORTUN, GEORGE II and MA. CONCEPCION, all surnamed MISA, minors and represented by their parents GEORGE and MYRA MISA, BENJAMIN ALAN V. PESIGAN, minor, represented by his parents ANTONIO and ALICE PESIGAN, JOVIE MARIE ALFARO, minor, represented by her parents JOSE and MARIA VIOLETA ALFARO, MARIA CONCEPCION T. CASTRO, minor, represented by her parents FREDENIL and JANE CASTRO, JOHANNA DESAMPARADO, 
minor, represented by her parents JOSE and ANGELA DESAMPRADO, CARLO JOAQUIN T. NARVASA, minor, represented by his parents GREGORIO II and CRISTINE CHARITY NARVASA, MA. MARGARITA, JESUS IGNACIO, MA. ANGELA and MARIE GABRIELLE, all surnamed SAENZ, minors, represented by their parents ROBERTO and AURORA SAENZ, KRISTINE, MARY ELLEN, MAY, GOLDA MARTHE and DAVID IAN, all surnamed KING, minors, represented by their parents MARIO and HAYDEE KING, DAVID, FRANCISCO and THERESE VICTORIA, all surnamed ENDRIGA, minors, represented by their parents BALTAZAR and TERESITA ENDRIGA, JOSE MA. and REGINA MA., all surnamed ABAYA, minors, represented by their parents ANTONIO and MARICA ABAYA, MARILIN, MARIO, JR. and MARIETTE, all surnamed CARDAMA, minors, represented by their parents MARIO and LINA CARDAMA, CLARISSA, ANN MARIE, NAGEL, and IMEE LYN, all surnamed OPOSA, minors and represented by their parents RICARDO and MARISSA OPOSA, PHILIP JOSEPH, STEPHEN JOHN and ISAIAH JAMES, all surnamed QUIPIT, minors, represented by their parents JOSE MAX and VILMI QUIPIT, BUGHAW CIELO, CRISANTO, ANNA, DANIEL and FRANCISCO, all surnamed BIBAL, minors, represented by their parents FRANCISCO, JR. and MILAGROS BIBAL, and THE PHILIPPINE ECOLOGICAL NETWORK, INC., petitioners, 
vs.
THE HONORABLE FULGENCIO S. FACTORAN, JR., in his capacity as the Secretary of the Department of Environment and Natural Resources, and THE HONORABLE ERIBERTO U. ROSARIO, Presiding Judge of the RTC, Makati, Branch 66, respondents.