Climate change is a real deal. So, hey deniers - cut it out, and let's get to work.

But investment in space stimulates society, it stimulates it economically, it stimulates it intellectually, and it gives us all passion.

The world's going to change climatically. We just want to control the change. We want to have a high quality of life for billions of people as we pass through this era.

Science is the key to our future, and if you don't believe in science, then you're holding everybody back.

If you memorize the periodic table it will speed you up if you're a chemist, but by and large, the reason you have a periodic table is so that you can store that information outside of your body. That way it frees up some part of your brain to do something else...

The most serious problem facing humankind is climate change. All of these people breathing and burning our atmosphere has led to an extraordinarily dangerous situation. I hope next generation will emerge and produce technology, regulations, and a worldview that enable as many of us as possible to live happy healthy lives.

The oncoming trouble I speak of is climate change. It's going to affect all of you in the same way the Second World War consumed people of my parent's generation.