It's taken us a short time to change the nature of nature. In my lifetime, more change than during all preceding human history put together.

Humans have always wondered the big questions, "Who am I? Where have I come from? Where am I going?" It's part of human nature. It's perhaps the underpinnings of religion.

We are all together in this, we are all together in this single living ecosystem called planet earth.

The image of Earth from space transformed our view of ourselves. It is maybe the most important image that exists - because we can see ourselves in context in a way that otherwise would be really hard to explain. It should inspire us to wonder about it, to want to know everything we can about it and do everything we can to take care of it.

We are not only warming the ocean and the planet as a whole, but we are also acidifying the ocean and changing its chemistry.

If I seem like a radical it's because I have seen things that others have not.

The burning of fossil fuels has altered the amount of carbon dioxide in the atmosphere so rapidly and so abundantly that now, we are driving not just the warming trend, not just the sea level rise that is a consequence of the warming trend that is melting polar ice and alpine ice, but also [ocean acidification].