Hill: Sen. Marco Rubio (R-Fla.) pushed back against proposals to fight climate change, saying there is no law that could impact global carbon dioxide emissions during Thursday's Republican presidential debate. In one of the most lengthy exchanges on the issue in any GOP debate in the 2016 cycle, the Florida senator avoided saying whether he believes human activity contributes to climate change. Instead, he said liberals want to implement climate policies that would ruin the economy with absolutely no...