The struggle to avert catastrophic climate change is bigger than all the other struggles, whether it is slavery, democracy struggles, the woman's right to vote, and so on I would argue that if what is at stake is securing life as we know it, then there can be no bigger struggle that we face.

Nelson Mandela also spoke about how, as a human being, he's made mistakes.

The reality is today most of our political leaders want to be treated as gods and semi-gods, from the security details to the fuss around them and so on.

In Durban, where I was born and grew up, and all over Africa, Nelson Mandela was a hero! Now he is a hero to the world.

Sandy was a climate change warning. Obama must now take the stage and fulfil the promise of hope the world needs.

This week we saw progressive business and faith leaders making strong commitments that are moving ahead of what world leaders promised today. The leaders of major economies must be bolder than they were today in providing a vision for 100% renewable energy for all.

[Nelson] Mandela was very keen not to be understood as an exceptional person.