**US Government Faces Lawsuit Over Climate Change Policy Rollback** Health and environment advocacy groups in the United States are suing the Environmental Protection Agency (EPA) over the Trump administration's decision to withdraw a key 2009 climate change ruling known as the "endangerment finding". This move, made in February, revoked the EPA's declaration that greenhouse gases are a risk to public health and environmental safety. The endangerment finding, established under the presidency of Democrat Barack Obama, had formed the legal basis for many regulatory policies aimed at curbing climate change. It stated that carbon dioxide and other greenhouse gases pose a threat to public health and welfare. The EPA, under President Obama, used this ruling to move forward on policy aimed at limiting the release of greenhouse gases in the US. This included requiring power plants to meet federal limits on carbon emissions or risk being shut down. The Trump administration's support for the move was touted as the "single largest deregulatory action in US history". However, the lawsuit alleges that the decision will risk the health and welfare of US citizens. "Repealing the Endangerment Finding endangers all of us," said Peter Zalzal, associate vice president of clean air strategies at the Environmental Defense Fund, one of the plaintiffs. "People everywhere will face more pollution, higher costs, and thousands of avoidable deaths." This is not the first time a US president has overseen policies damaging to the environment. Critics argue that deregulation and prioritization of fossil fuel production have been a hallmark of US policy for decades. The Trump administration's decision to rescind the endangerment finding is the latest in a series of steps aimed at reversing climate regulations. According to Brett Heinz, a Washington, DC-based policy researcher, "By allowing for increased pollution, these recent changes will harm practically every single person on the planet." Those living near fossil fuel facilities will be among the most immediately affected, as they will be exposed to new air and water pollution unleashed by deregulatory policies. Michael Kraft, professor emeritus of political science and public and environmental affairs at the University of Wisconsin-Green Bay, highlighted the significance of the endangerment finding in allowing the EPA to move forward on policy aimed at limiting greenhouse gas emissions. Under the Obama administration, this led to investments in detecting and fixing methane leaks, curbing flaring, and improving tailpipe and fuel-economy standards.