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View Carbon Offset Certification's top competitors like Airfix, American Carbon Registry, and CDP.

NRDC is the nation's most effective environmental action organization. We use law, science and the support of 1.3 million members and online activists to protect the planet's wildlife and wild places and to ensure a safe and healthy environment for all living things. Worth Magazine has named NRDC one of America's 100 best charities, and the Wise Giving Alliance of the Better Business Bureau reports that NRDC meets its highest standards for accountability and use of donor funds. NRDC was founded in 1970 by a group of law students and attorneys at the forefront of the environmental movement. NRDC lawyers helped write some of America's bedrock environmental laws. Today, our staff of more than 300 lawyers, scientists and policy experts -- a MacArthur "genius" award-winner among them -- work out of offices in New York, Washington, Chicago, Los Angeles, San Francisco and Beijing. The New York Times calls us "One of the nation's most powerful environmental groups." The National Journal says we're "A credible and forceful advocate for stringent environmental protection." With the support of our members and online activists, NRDC works to solve the most pressing environmental issues we face today: curbing global warming, getting toxic chemicals out of the environment, moving America beyond oil, reviving our oceans, saving wildlife and wild places, and helping China go green.
New York, New York, US
Non profit
$55.4M Revenue
http://www.nrdc.org
1.1K Employees
Sierra Club
At the Sierra Club, we believe in the power of togetherness. Together, we remain committed to the fight for a healthy climate built on a foundation of environmental, racial, economic, and gender justice – a future where all people benefit from a healthy, thriving planet and a direct connection to nature. As the climate crisis and deeply entrenched systemic racism all fuel inequity, we will continue to fight for a bold, transformational agenda that recognizes the interconnectedness between our planet, our humanity, and our democracy. By recognizing that our destinies are tied, we continue to name that all things are fundamentally connected, and the overlap between ecology, race, gender, and representative government will move to either advance our collective humanity or to oppress it. Sierra Club is comprised of staff across the country and a network of local chapters that support our grassroots engagement. We are also proud to be a unionized employer, with two labor unions representing more than half of our employees. Please view www.sierraclub.org/careers/ for more information.
Oakland, California, US
Non profit
$114.8M Revenue
https://www.sierraclub.org
1.4K Employees
CDP
As the founder of environmental reporting, we believe in transparency and the power of data to drive change. Partnering with leaders in enterprise, capital, policy and science, we surface the information needed to enable Earth-positive decisions. We supported more than 22,100 companies and over 1,000 cities, states and regionsdisclose their environmental impacts in 2025. Financial institutions with more than a quarter of the world’s institutional assets use CDP data to help inform investment and lending decisions. Our team is truly global, united by our shared desire to build a world where people, planet and profit are truly balanced. To meet the scale and speed of today’s environmental challenges and market expectations, CDP is becoming two separate organizations – a commercial entity, CDP, and a non-profit CDP Foundation. They will be united in shared ambition: to surface new information, enabling Earth-positive decisions to protect future generations. More information to follow.
UK
Private
$30.1M Revenue
http://www.cdp.net
1.2K Employees

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