Environmental Defense Fund (EDF)

New York City, USA (headquarters) · 12 US offices · International offices in China, Europe, and Mexico · Founded 1967

Overview

The Environmental Defense Fund is one of the world's most influential environmental organizations — founded in 1967 from the audacious act of ten scientists and an attorney incorporating in a borrowed conference room at Brookhaven National Laboratory, with no members, no staff, no office, and no bylaws, to pursue what was at the time a novel legal strategy: taking environmental protection to court. Fifty-eight years later it has more than 3.5 million members, revenue of $312.9 million (2024), more than 1,000 staff, offices on three continents, and a satellite orbiting Earth to measure global methane emissions. The organization's signature contribution to environmental law and policy is the model it established from its very first case: marrying science and law to defend the environment in court, combining the evidentiary precision of scientific expertise with the procedural power of legal action in a combination that neither discipline could achieve alone.

EDF is distinctive among major environmental organizations for its market-oriented approach — its emphasis on economic incentives, cap-and-trade mechanisms, and strategic corporate partnerships alongside litigation and regulatory advocacy. This pragmatic orientation has made it a frequent target of criticism from environmental advocates who see corporate partnerships as compromising; it has also made EDF unusually effective at achieving measurable environmental outcomes in arenas where purely adversarial approaches have stalled. President Fred Krupp, who has led the organization since 1984, has guided EDF from 40,000 members to its current scale while consistently articulating this market-and-science synthesis as the organization's defining characteristic.

Founding: DDT, the Osprey, and the Birth of Environmental Law

The story of EDF's founding is the story of the first successful environmental lawsuit in American history. In the early 1960s, osprey populations on Long Island, New York, had collapsed — from more than 200 active nests in the 1940s to near zero by the mid-1960s. Charles Wurster, an assistant professor of biological sciences at the State University of New York at Stony Brook, and colleagues including Art Cooley and Dennis Puleston documented the cause: DDT, the organochlorine pesticide sprayed by Suffolk County's Mosquito Control Commission, was causing eggshell thinning so severe that osprey eggs cracked under the weight of incubating adults. The mechanism — DDT's concentration as it moved up the food chain, with fish-eating birds at the top accumulating lethal doses — was exactly the process Rachel Carson had described in Silent Spring (1962).

In 1966, the group joined forces with Victor John Yannacone — a confrontational Long Island lawyer who had already filed suit against the Mosquito Commission on behalf of his wife Carol after she observed dead fish in a local pond following DDT spraying. The alliance of scientists providing evidence and lawyers providing litigation proved immediately effective: the court imposed a temporary ban on DDT spraying in Suffolk County in 1966. The case attracted national attention out of all proportion to its local scale. Appeals for help arrived from across the country. The group of scientists and attorneys decided to organize formally. In October 1967, ten of them gathered in a borrowed conference room at Brookhaven National Laboratory to sign the Certificate of Incorporation of Environmental Defense Fund. Wurster later wrote: "There was no organization, office, staff, members or bylaws." From that starting point, EDF went on to play a central role in securing a statewide DDT ban in New York in 1970 and the nationwide DDT ban in 1972. The osprey, the bald eagle, and the peregrine falcon — all devastated by DDT — have since recovered and been removed from the endangered species list.

Strategic Approach: Science, Economics, Law, and Corporate Partnership

EDF describes its approach as integrating four elements: science, economics, law, and innovative private-sector partnerships. The science element is foundational — EDF employs PhD scientists across its program areas and treats scientific credibility as a prerequisite for policy influence. The economics element distinguishes EDF from many environmental organizations: rather than relying solely on regulatory mandates and litigation, EDF has consistently argued that environmental protection is more durable and more efficiently achieved when it aligns economic incentives with ecological outcomes. This philosophy produced EDF's influential role in designing the cap-and-trade approach to sulfur dioxide emissions under the Clean Air Act Amendments of 1990 — a market mechanism that achieved the targeted reductions in acid rain at a fraction of the cost that uniform regulatory mandates would have required, and that became the template for subsequent emissions trading systems including the EU Emissions Trading System.

The corporate partnership element has been both EDF's most distinguishing feature and its most contested. Krupp has led partnerships with FedEx (converting delivery fleets to hybrid vehicles), McDonald's (eliminating polystyrene packaging), KKR (improving environmental performance across portfolio companies), and Walmart (supply chain sustainability), among others. Critics, including some within the environmental movement, argue that such partnerships can neutralize advocacy and provide corporate "greenwashing" cover without equivalent environmental benefit. EDF's response is empirical: these partnerships have produced documented, measurable environmental improvements — quantified reductions in emissions, energy use, and waste — that would not have occurred through adversarial approaches alone.

Programs and Focus Areas

Climate and Energy

EDF's largest program area — covering carbon pricing, clean electricity standards, methane regulation, building decarbonization, and industrial emissions. Includes regulatory advocacy before EPA, state-level policy, and international engagement through the UNFCCC process. The program produced EDF's signature role in cap-and-trade policy design and continues its advocacy for carbon pricing mechanisms at state and federal levels.

MethaneSAT

A satellite launched by EDF and now orbiting Earth to measure and map methane emissions from the oil and gas industry worldwide. The first satellite dedicated to monitoring a specific greenhouse gas at the scale and resolution needed to hold corporate and national emitters accountable for their reported emissions. Funded in part by a $10 million Bezos Earth Fund grant (2024). At COP28 (2023) Krupp leveraged MethaneSAT data commitments to secure pledges from 50 oil and gas companies to reduce methane by 90% by 2030.

Oceans

Fisheries management, marine ecosystem protection, and ocean climate impacts. EDF has been a leading advocate for catch share systems — market-based mechanisms that give fishing communities a stake in maintaining sustainable fish populations, replacing the "race to fish" dynamic that had depleted many US fisheries. The approach has been adopted in dozens of US fisheries and replicated internationally.

Ecosystems and Land

Protecting and restoring ecosystems on land — from agricultural land conservation to wetlands and forests. Includes EDF's work on natural climate solutions (forests, wetlands, and soils as carbon sinks) and on agricultural practices that reduce emissions and protect water quality. EDF has been active in USDA conservation program design and in voluntary carbon market standards for agricultural land.

Health

Air pollution and chemical safety — the program area most directly continuous with EDF's founding DDT work. Covers toxic chemical regulation under TSCA (reformed in 2016 partly through EDF advocacy), air quality standards, environmental justice, and the health dimensions of climate change. EDF's health program was central to the bipartisan 2016 overhaul of the Toxic Substances Control Act — the first major update to chemical safety law since 1976.

International

Work in China (Beijing office, focusing on air quality, energy transition, and climate policy), Europe (Brussels office, engaging EU policy), and Mexico (Mexico City office, focusing on energy reform and oil and gas methane). EDF's international program has been particularly active on methane — working with national governments and companies on measurement, reporting, and reduction commitments.

President Fred Krupp

Fred Krupp has been president of EDF since 1984 — a tenure spanning four decades that makes him one of the longest-serving leaders of any major environmental organization in the United States. A graduate of Yale University and the University of Michigan Law School, he joined EDF at 30 years old and has guided its growth from 40,000 members and a small staff to its current scale of 3.5 million members and more than 1,000 staff. His approach — combining legal expertise, economic pragmatism, and a willingness to engage corporate actors directly — has shaped EDF's identity as an organization that seeks to be in the room where decisions are made rather than exclusively outside it. He has appeared before the TED conference to announce MethaneSAT, testified before Senate committees on climate legislation, and served as a key advocate for both the 2016 chemical safety law reform and the 2022 Inflation Reduction Act's climate provisions.

Access and Membership

EDF's research reports, policy analyses, and advocacy resources are freely accessible at edf.org. Members and donors support EDF's programs at any amount; membership information is at edf.org/join. MethaneSAT data and the satellite's mission are described at methanesat.org. EDF's ocean fisheries work, climate advocacy publications, and health program resources are accessible through the respective program pages. EDF headquarters: 257 Park Avenue South, New York, NY 10010. Phone: (212) 505-2100.