Nicholas Stern

We can look back through ice-core data and see over 800,000 years, relationships between carbon dioxide and the temperature of the world. So those people who deny the importance of climate change are just wasting their time. They're also being diversionary because if we don't act the risks are enormous.

The basic scientific conclusions on climate change are very robust and for good reason. The greenhouse effect is simple science: greenhouse gases trap heat, and humans are emitting ever more greenhouse gases.

Short stories are my favorite art form. A good one is compact and complete, a telling little slice of life, capturing a moment in time that - for the character - defines her, changes her, is the tipping point for all that will follow.

I'm the only candidate which has a policy about how to bring economic opportunity - using clean, renewable energy as the key - into coal country, because we're going to put a lot of coal miners and coal companies out of business.