The Trump administration is set to announce its plans to abolish the US government’s authority to regulate greenhouse gases, threatening to strike a deep blow at Washington’s ability to fight climate change. 
The Environmental Protection Agency will unveil a proposal in Indiana on Tuesday to scrap a landmark determination that planet-warming gases endanger public health and welfare, the agency’s administrator, Lee Zeldin, said in a podcast. If finalized, the move would lay the foundation to unwind a host of regulations limiting emissions from power plants, oil wells and automobiles. 
Rolling back the 2009 endangerment finding would be among the most ...