President Donald Trump's administration has proposed revoking a scientific finding that's long been the central basis for U.S. action to regulate greenhouse gas emissions and fight climate change. The proposed Environmental Protection Agency rule rescinds a 2009 declaration that determined carbon dioxide and other greenhouse gases endanger public health. The "endangerment finding" is the legal underpinning of a host of climate regulations under the Clean Air Act for motor vehicles, power plants and other pollution sources. EPA Administrator Lee Zeldin announced the proposed rule change on a podcast ahead of an official announcement set for Tuesday in Indiana. Three former EPA leaders say Zeldin's proposal would endanger the lives of millions of Americans.

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Arnold Schwarzenegger has a message for environmentalists who despair at the the approach of President Donald Trump's administration: "Stop whining and get to work." The new U.S. administration has taken an ax to Biden-era environmental ambitions, rolled back landmark regulations, withdrawn climate project funding and instead bolstered support for oil and gas production. The former Republican governor of California has devoted time to environmental causes since leaving political office in 2011. On Tuesday at the Austrian World Summit in Vienna, Schwarzenegger pointed to examples of local and regional governments and companies taking action and argued 70% of pollution is reduced at the local or state level.

California is spending $500 million to put an additional 1,000 electric school buses on the road. Gov. Gavin Newsom's office announced Wednesday that 1,000 zero-emission school buses and related charging infrastructure will be provided to over 130 rural, low-income and disadvantaged school districts. It comes as cuts and freezes of federal grants paused efforts in other states to replace aging diesel-fueled fleets that are more polluting. In California, the efforts do not rely on federal money primarily but rather proceeds from its cap-and-trade program. The program caps carbon emissions and requires polluters to obtain permits for each ton of carbon they release.