TED (Technology, Entertainment and Design) is a great site to practice your listening skills. Each video lasts just 20 minutes and are full of thought provoking ideas. If you want to download an mp3 of the talk click here.
"With the same humor and humanity he exuded in An Inconvenient Truth, Al Gore spells out 15 ways we can address climate change, from buying a hybrid car to inventing a hotter brand name for global warming. First, though, comes a hilarious set of stories from The New Gore, who turns out to be a stand-up comedian. The former Vice President has plenty of joke material, and he's funnier than you've ever seen him. Then he gets down to grittier matters with a list of actions ordinary people can take to stem the tide of global warming. His message: Doing something is easier than you think."