It's baffling why the issues relating to climate change - [which] have far more obvious and tangible and much more clear-cut evidence about the cause - have been slower for people to accept as a given.

The Earth is a unique system in the universe, the only planet we know of that's hospitable for humankind.

We need to respect the oceans and take care of them as if our lives depended on it. Because they do.

I hope that someday we will find evidence that there is intelligent life among humans on this planet.

Why does evolution matter? There is so much about the evolution of life, the development of life on Earth that should rivet the attention of everyone to understand where we've come from and where we might be going. We need to understand the world around us if we are to succeed as a species on the planet.

The oxygen cycle, the nitrogen cycle, the carbon cycle, the water cycle - all of these are linked to the existence of life in the sea.

You should ask where your food is coming from.