In awarding the honour, the Nobel committee singled out Al Gore as "probably the single individual who has done most to create greater worldwide understanding of the measures that need to be adopted". President Bill Clinton expressed similar feelings,
"Gore's ex-boss, former President Clinton, also said he's 'thrilled by this well-deserved recognition,' and credited Gore with 'warning and educating us about the dangers of climate change for decades. He saw this coming before others in public life.'"
Gore stated that he will donate his half of the $1.5 million dollar prize to the Alliance for Climate Protection, an organization he founded to persuade people to reduce global warming by cutting greenhouse gas pollution.
You can see the announcement via YouTube.