In his convention speech on Wednesday night, Democratic vice presidential candidate Joe Biden said an Obama administration will make “alternative energy a national priority … creating 5 million new jobs, and finally breaking us from the grip of foreign oil.” Biden accused John McCain of being wrong on everything “from Amtrak to veterans,” and said, “John voted again and again against renewable energy — wind, solar, biofuels. That’s not change, that’s more of the same.” In an earlier speech, Bill Clinton said Obama will find “economically beneficial ways to fight global warming … and when Barack Obama unleashes them, America will save lives, create new jobs.” Clinton also tossed in a little climate humor, noting that the tight race between Obama and Hillary Clinton earlier this year “created so much heat, it increased global warming.” In other convention fun, we’ve got photos of the “clean coal” and wind-power displays around Denver. And be sure to check out the rest of Grist’s convention coverage.