"The endangerment finding was built on a 2007 Supreme Court case, Massachusetts v. EPA, which determined that the EPA did have the authority under the 1970 Clean Air Act to regulate greenhouse gases because of their threat to public health. This decision allowed the EPA to carry out regulatory policies to restrict emissions of these harmful gases. Regulations are particularly important for transportation, which represents the largest share – 28% – of greenhouse gases released by the U.S. each year. The EPA’s own website says as much, which is deeply ironic given the Trump administration’s new policy eliminates all federal regulations on greenhouse gas emissions for vehicles and engines from 2012 onwards. These regulations help prevent companies from simply having their fossil fuel output run rampant. Eliminating the regulations would mean America is now significantly out of step with other industrialized countries, which are busy expanding their own environmental protections and renewable energy sources. Trump’s mission of deregulation represents a major step backwards, and it’s about to cast aside restrictions in an area where the U.S. is already failing to protect the environment. Essentially, the Trump administration’s main argument for revoking the endangerment finding is that American taxpayers will save $1.3 trillion due to deregulation. Since the idea of cost is apparently so important to Trump, according to a federal report from 2023, climate change is costing the U.S. $150 billion per year. That is a conservative estimate that only factors in direct damages, and the number will only grow larger as temperatures and sea levels rise, setting up more frequent and more destructive extreme weather events."