By looking at climate change as a clean energy generation problem, we're setting ourselves up not to solve it.

By looking at climate change as a clean energy generation problem, we're setting ourselves up not to solve it.

I think we're going to start to see a new model of civic advocacy where people get together once in a while to protest, but it's more about an ongoing, sustained engagement in issues, networks and communities about which people care.

The planet's biggest problems have to do with sustainability, environmental decline, global poverty, disease, conflict and so forth. Really, they're all interconnected - it's one big problem, which is that the way we're doing things can't go on.

Carbon zero simply means that the emissions you are releasing either are zero or balance out to zero.

Optimism is a political act. Those who benefit from the status quo are perfectly happy for us to think nothing is going to get any better. In fact, these days, cynicism is obedience.

It's not just enough to survive. We've got to make something better than what we've got.