Scientists have been saying, for an awfully long time, that we're all interconnected. Scientists would use the word 'ecosystem' to express that idea. Obviously, people can't survive without air and water, and we rely on plants and animals for food, and plants and animals rely on us to preserve their habitats.

There's real economic costs to climate change - So, Superstorm Sandy led to billions of dollars in damages. The fires out in the west, 70 million dollars a day are being spent in fighting fires that have clearly been exacerbated by drought and climate change. So, people have pointed out the true dollars and cents cost of inaction on climate change.

Most people have thought of ... climate change as a problem about the environment that is separate and distinct from problems of human wellbeing.

We don't survive without plants and animals because we rely on them, we rely on plants to put oxygen into the atmosphere, we rely on ... fish and crops and cows to eat.

Many people have the impression that there is significant scientific disagreement about global climate change. It's time to lay that misapprehension to rest. There is a scientific consensus on the fact that Earth's climate is heating up and human activities are part of the reason. We need to stop repeating nonsense about the uncertainty of global warming and start talking seriously about the right approach to address it.

Scientists should continue doing what they've always done, which is to understand the Earth as well as they can.

I think Pope Francis is our Pope Francis. I mean, the point of him is that he's a global leader, and he's trying, I think he's embracing that role.