David Grinspoon : (7) " What I’m interested in is the conversations going on about the Anthropocene and what it means to view ourselves as a part of Earth’s geological history. " - David Grinspoon " We don’t know that Venus had oceans, but there’s every reason to believe it did. " - David Grinspoon " There is a history of thinking about space science from an environmental ethics perspective. And part of what I want to do is turn that back and use that experience to see if it reflects how we think about the Earth. " - David Grinspoon " It’s OK to pursue speculative ideas because we don’t want to be too cozy and safe and assume that we know everything about life in the universe. However, we have to be rigorous and careful and honest and logical and scientifically meticulous when we speculate. " - David Grinspoon " When I first went to college, I went into physics, and my goal was to help perfect nuclear fusion so I could solve the energy crisis and global warming. I probably would have done it, too, if I’d stuck to it. " - David Grinspoon " We can look out on an alien landscape that no one has seen before and find it beautiful. " - David Grinspoon " Now, humans have become a dominant force of planetary change and, thus, we may have entered an eon of post-biological evolution in which cognitive systems have gained a powerful influence on the planet. " - David Grinspoon