By MICHAEL BIESECKERWASHINGTON (AP) — Donald Trump plans to dismantle President Barack Obama's efforts to reduce planet-warming carbon emissions. But delivering on his campaign pledges to abolish the Environmental Protection Agency and bring back tens of thousands of long-gone coal mining jobs could prove far more difficult. Internal documents from the president-elect's transition team reviewed by The Associated Press show the new administration plans to stop defending the Clean Power Plan and other recent Obama-era environmental regulations that have been the subject of long-running legal challenges filed by Republican-led states and the fossil fuel industry. Against that potential opposition, environmental groups are gearing up to defend Obama's environmental legacy in court. "We anticipate challenging every single attempt to roll back regulations on air, water and climate," said Sierra Club Executive Director Michael Brune, who added that his group is already hiring additional lawyers. Fundraising for environmental causes also has spiked since Trump's victory. Though Republicans have for years blamed environmental regulations for the decline of coal, data from the U.S. Department of Energy shows the primary cause is the emergence of cheaper, more abundant natural gas from hydraulic fracturing. Another factor is the plummeting cost of solar panels and wind turbines, which now can produce emissions-free electricity cheaper than burning coal. Leading Trump's transition team on the EPA is Myron Ebell, director of the Center for Energy and Environment at the Competitive Enterprise Institute, a libertarian think tank that gets financial support from the fossil fuel industry and that opposes "global-warming alarmism." Though his academic credentials are in philosophy and political theory, Ebell is an enthusiastic denier of the voluminous scientific data that show the planet is warming and that burning fossil fuels is primarily to blame. Trump said during the campaign he would "cancel" the Paris agreement to make global reductions in carbon emissions that Obama signed in December.