Back to the resource library Earthworks’ IRS Letter of Determination September 28, 2015 Download Certification of 501(c)3 status See All Related Resources Minimizing Mining Impacts on the Road to Zero Emissions Transport CERTIFIED GASLIGHTING: Fact Sheet CERTIFIED GASLIGHTING: How gas certification has gained a policy foothold, even as it fails to prove it can accurately detect emissions Earthworks 2024 Campaign Plan