The Trump administration has granted nearly 70 coal-fired power plants a two-year exemption from federal requirements to reduce emissions of toxic chemicals such as mercury, arsenic and benzene. A list quietly posted as of Tuesday on the Environmental Protection Agency's website lists 47 power providers — which operate at least 66 coal-fired plants — that are receiving exemptions from the Biden-era rules under the Clean Air Act, including a regulation limiting air pollution from mercury and other toxins. The actions follow an executive order last week by President Donald Trump aimed at boosting the struggling coal industry, a reliable but polluting energy source that’s long been in decline.