Al Gore

When did Al Gore become an optimist?

New clever species of praying mantis named after Al Gore

Al Gore says he'll likely stay vegan 'for life'

Al Gore finally drops meat, goes vegan

Al Gore Video: 'We're going to make it'

10 people to follow on Twitter who are working to save the world

Al Gore reportedly now worth more than $200 million, called 'Romney-Rich' by Bloomberg

Al Gore kicks off book tour for 'The Future'

What if climate-change doubters held a debate and nobody came?

Battle of the climate-change billboards rages on

Al Gore spills the beans on new iPhone

As Greenpeace turns 40, the eco-movement aches for another wave of innovation