The doctor who diagnosed me with ALS, or motor neuron disease, told me that it would kill me in two or three years.

If it were only a few degrees, that would be serious, but we could adapt to it. But the danger is the warming process might be unstable and run away. We could end up like Venus, covered in clouds and with the surface temperature of 400 degrees. It could be too late if we wait until the bad effects of warming become obvious. We need action now to reduce emission of carbon dioxide.

Do you ever wonder how much deeper the ocean would be without sponges?

We won't know for a few years.

Our only chance of long-term survival is not to remain lurking on planet Earth, but to spread out into space.

One does not have to appeal to God to set the initial conditions for the creation of the universe, but if one does He would have to act through the laws of physics.

It [AI] would take off on its own and redesign itself at an ever increasing rate. Humans, who are limited by slow biological evolution, couldn't compete and would be superseded.