EcoWatch: President Obama doubled down on climate and clean energy Monday saying, No challenge poses a greater threat to our future than climate change. Speaking at the eighth Clean Energy Summit, in his first public appearance since vacation, President Obama launched an 11 day climate barnstorming campaign. His blunt speech directly challenged climate sceptics as ignoring the new logic of the market, saying that now clean energy was cheaper, fossil interests still refused to embrace change. Obama asserted,...