U.S. President Donald Trump will sign an executive order on Tuesday to undo a slew of Obama-era climate change regulations that his administration says is hobbling oil drillers and coal miners, a move environmental groups have vowed to take to court. The decree’s main target is former President Barack Obama’s Clean Power Plan, requiring states to slash carbon emissions from power plants – a critical element in helping the United States meet its commitments to a global climate change accord reached by nearly 200 countries in Paris in 2015.
