Hindsight can be merciless. People of any given era often look back in time and wonder how their predecessors could have been so dimwitted.

There is a glacier in Iceland, Solheimar, which has retreated a great deal, and every time I go back there and see what's not there any more, it does something to the heart. It makes you realise it's possible for a gigantic natural element to just disappear.

Climate change is real. Climate change is being substantially increased by humans and the carbon we put into the atmosphere. And it appears to be speeding up. If science has made any mistakes, science has been underestimating it.

Once upon a time, I was a climate-change skeptic.

We are now beyond nature's normal variation in terms of how the atmosphere is composed. Nature did something for a million years. It actually goes back a lot further than that, but the ice core records show a million years. So, nature has this normal oscillation within this zone, and all of a sudden, we're forty percent outside that zone.

When you put the subjectivity of the art together with the context of the science, you have this very powerful conjunction of opposites and together they are greater than either one could ever be.