A federal appeals court rejected the Trump administration's attempt to halt a landmark climate change lawsuit on Wednesday, ruling that the case can proceed to trial in a lower court.  The lawsuit, brought in 2015 by 21 youths, argues that the federal government has violated their constitutional rights by failing to act on climate change...The plaintiffs are asking the courts to force the government to enact policies that would cut the nation's greenhouse gas emissions and end subsidies to fossil fuel companies...In the ruling published Wednesday...chief judge of the 9th Circuit Court of Appeals, wrote that the government's concerns would be "better addressed through the ordinary course of litigation."...If the case does proceed to trial, each side will have to produce documents and submit to depositions first...