By Jarrett Renshaw, Timothy Gardner and Trevor Hunnicutt WASHINGTON (Reuters) -U.S. President Donald Trump signed executive orders on Tuesday that aim to boost coal production in his latest action that runs counter to global efforts to curb carbon emissions.

President Donald Trump has signed four executive orders aimed at boosting coal, a reliable but polluting energy source that’s long been in decline.

The moves include loosening environmental rules, but it is unclear how much they can help reverse the sharp decline in coal power over the last two decades.