The Philippine lawyer who beat an oil giant: Rose Liza Eisma- Osori on defending Tañon Strait
In 2007, Philippine environmental lawyer Rose Liza Eisma-Osorio set out to stop Japan Petroleum Exploration (JAPEX) from drilling in Tañon Strait, a protected seascape between Cebu and Negros that is home to 14 whale and dolphin species. She and Gloria “Golly” Estenzo Ramos filed a petition that December naming the marine mammals as petitioners, with the two lawyers representing them as their stewards, at the same time as colleagues filed a second petition on behalf of fishing communities impacted by exploration activities. This approach was deliberate as Philippine courts require proof of personal injury, meaning if the court refused to hear the animals, the lawyers could still represent them as stewards, and the fisherfolk’s reduced catch would serve as the injury requirement. JAPEX withdrew before the court ruled, which Eisma-Osorio calls an early victory, and in April 2015 the Supreme Court voided the exploration contract and set a precedent that citizens can represent nature as stewards and give it legal standing without proving personal injury, making environmental cases easier to file. Rosa then joined Oceana Philippines, where she is now senior director of the campaign and legal departments, and helped develop a management plan for Tañon Strait, which had been protected since 1998 but never had a plan. Today she is organizing over the October 2025 ethanol wastewater spill in Bais Bay, where Silliman University scientists found killed up to 69% of coral cover. The Department of Environment and Natural Resources has filed a criminal action against the corporation, and Oceana is consulting fishing communities to build a court case. Eisma-Osorio expects a long fight and says it must be waged alongside the community, that nothing about them should be without them.




