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.

The same mentality that leads to environmental despoliation, environmental destruction, also leads to damage to people.

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

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

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.

I think it is important for people to understand that there are real serious economic costs and real serious economic damages associated with inaction on climate change.

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.