It would take an extremely large spacecraft to deflect a large asteroid that would be headed directly for the Earth.

By preventing dangerous asteroid strikes, we can save millions of people, or even our entire species. And, as human beings, we can take responsibility for preserving this amazing evolutionary experiment of which we and all life on Earth are a part.

While we didn't know the dinosaurs personally, we do know that they were wiped out by an asteroid impact.

As you pass from sunlight into darkness and back again every hour and a half, you become startlingly aware how artificial are thousands of boundaries we've created to separate and define. And for the first time in your life you feel in your gut the precious unity of the Earth and all the living things it supports.

We can both prevent asteroid impacts and address climate change. It's not either-or.

It would take an extremely large spacecraft to deflect a large asteroid that would be headed directly for the Earth.

Journalists often put things into either-or scenarios.