"Wonder if there is life on another planet? Let's suppose there is. Suppose further, that only one star in a trillion has a planet that could support life. If that were the case, then there would be at least 100 million planets that harbored life"
"Now, we put out a lot of carbon dioxide every year, over 26 billion tons. For each American, it's about 20 tons. For people in poor countries, it's less than one ton. It's an average of about five tons for everyone on the planet. And, somehow, we have to make changes that will bring that down to zero"
"We're looking at Earth science, observing our planet. Also space science, looking at the ozone in the atmosphere around our Earth. Also looking at life science. And on a human level, using ourselves as test subjects"
"Almost a quarter of our planet is a single mountain range and we didn't enter it until after Neil Armstrong and Buzz Aldrin went to the moon. So we went to the moon, played golf up there, before we went to the largest feature on our own planet"
"Whether we are poor among the poorest, or less poor among the wealthier, let us stand proud and noteworthy, united and strong, comforted by our belonging to the Community of the Free Nations of our Planet"