I've got personal views on the '60s. You can't have freedom without paying the price for it.

NASA will send up a big sun shade that will be in orbit between the earth and sun and deflect 2 or 3 percent of the sunshine back into space. It would be cheaper than the international space station.

By the end of this century, climate change will reduce the human population to a few breeding pairs surviving near the Arctic.

Sadly, it's much easier to create a desert than a forest.

Let's make hay while it lasts.

Just after World War II, this country led the world in science by every way you could measure it, yet the number of scientists was a tiny proportion of what it is now.

One pound of uranium is worth about 3 million pounds worth of coal or oil.