Climate change is having a dramatic effect on the ground.
Secondly, the nature of the revolutions which have altered the surface of the earth must have had a more decisive effect on the terrestrial quadrupeds than on the marine animals.
[Geology] may be looked upon as the history of the earth's changes during preparation for the reception of organized beings, a history, which has all the character of a great epic.
Continents may break up, continents may emerge, but the human race is immortal in its origin and in its growth, and there is nothing to be afraid of, even if the foundations of the earth be moved.
The most striking thing to me about human space flight and my own personal experience is that I've seen dramatic changes on Earth. We humans are rapidly changing the planet. I've watched Amazonia as the rainforest has been cut down. That's something I've seen out the window. I'm very worried about that.
[It] is the little causes, long continued, which are considered as bringing about the greatest changes of the earth.
As chief scientist, it's sort of my job to look at bridges between what we do and to see the connections. But when we try to understand how are planets around other stars habitable... to looking back at the Earth - how are the changes that are taking place, how are they going to affect humanity?
