We know that climate change is the single most important environmental issue facing the world today. ... The longer we wait the larger will be the challenge,

Canada must be a leader of climate change, ... It's important for us, for our north, for our role in the world.

In my view, the great long-term challenges today, apart from the most urgent need to tackle climate change, is creating meaningful employment for young people.

You couldn't necessarily say, 'That hurricane, that storm, that flood only happened because of climate change,' (but) you're starting to see a pattern of extreme weather events.

Bush agreed in Gleneagles that climate change was urgent.

Climate change is, in my view, long term, the single biggest issue that we face,