by U.S. Circuit Court of Appeals for the District of Columbia in 2008. Additionally, The Clean Air Mercury Rule (CAMR) was also introduced. CAMR was created for the purpose of establishing a permanent national cap on mercury emissions. Bush environmental legacy In the later years of the Bush administration, the president engaged in a series of environmental proposals. He called on countries with the largest greenhouse gases to establish a global goal to control emissions and in 2008 initiated the U.S to join the United Nations to negotiate a post-2012 global climate plan after Kyoto expires. The plan calls for inclusion of both developed and developing nations to address greenhouse gas emissions. In addition, during the later years, President Bush's position on climate changed. The president had taken steps in the later years of his presidency to address environmental criticism of his broken campaign promises, and argued that the Kyoto protocol was a plan to cripple the US economy. This stern position caused him serious credibility challenges on environmental issues both nationally and globally. The Obama Administration (2009–2017) Environmental issues were prominent in the 2008 presidential election. Democrat Barack Obama obtained a clear lead above his rival, Republican Senator John McCain, on the environment, winning the backing of 'all mainstream environmental groups' and public confidence on the issue. Upon election, appointments such as that of the Nobel prize-winning physicist Steven Chu were seen as a confirmation that his presidency was serious about environmental issues. One example of a new initiative by the Obama Administration is the America's Great Outdoors Initiative, which preserves and highlights numerous natural features, and also raises public awareness. The Trump Administration (2017–2021) The environmental policy of the Trump administration represents a shift from the policy priorities and goals of his predecessor, Barack Obama. While Obama's environmental agenda prioritized the reduction of carbon emissions through the use of clean renewable energy, the Trump administration has sought to increase fossil fuel use and scrap environmental regulations, which he has often referred to as an impediment to business. Trump has announced plans to pull the United States out of the 191 nation Paris agreement. At a presidential debate in March 2016, Trump said he would eliminate the EPA as a part of his plan to balance the budget. Trump's "America First Energy Plan", focuses on increasing the use of fossil fuels without mentioning renewable energy. It would repeal many