Of the three presidential candidates, Hillary Clinton is the one with the most aggressively stance on tackling global warming and supporting renewable energy. In February in Houston, she went to the oil companies and said you should be energy companies and embrace renewable energies.
The President of Shell Oil, Mr. John Hoftmesiter, said in his interview that last year (2007) Shell, along with the other major oil companies, invited ALL presidential contenders from both camps to give their presentation of their energy policy as President. Surprising to him and the other Oil Company Execs, only Hillary Clinton showed up and while she wasn't applauded vigorously on every tenet of her policy (taxes on oil), she was applauded for a concise well thought out program to deal with energy problems facing the US in the next few decades. Furthermore, Hoftmesiter chastised the Bush administration for not having a concise national energy policy as he said, "We have NO leadership in Washington." McCain, as well as Obama were nowhere to be seen at this Energy Summit.
I personally like Hillary's plan to create 5 million green-collar jobs in the renewable energy field and her plan for ConnieMaes (like Fannie Maes) to support homeowners to installing solar and other renewable energy fixtures.