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" Through space-based climate studies, my colleagues and I have learned that a stable and comfortable climate is not something to take for granted. "

David Grinspoon

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" In environments that are energy-rich but liquid-poor, like near the surface of Titan, natural selection may favor organisms that use their metabolic heat to melt their own watering holes. "

David Grinspoon

" Why should we consider defining intelligence as something global and as something that hasn't actually yet appeared on Earth? It may be useful for envisioning the future of our own civilization and any others that may be out there among the stars. It might give us something to strive for. "

David Grinspoon

" Responsible global behaviour is ultimately an act of self-preservation of, by, and for the global beast that modern technological humanity has become. "

David Grinspoon

" One of the weird things about modern physics is that we do find there are apparently these other dimensions that we don't directly experience that explain some aspects of the overall geometry and reality of our universe. "

David Grinspoon

" There are other planets besides the Earth and Mars. I'd like to remind you that studying Venus is vital to understanding life elsewhere. "

David Grinspoon

" There was a long history of people believing there was life on Venus. It was about the same size as Earth. It had clouds. It was commonly believed it was tropical - wet, hot and steamy. "

David Grinspoon

" Our most valuable resources - creativity, communication, invention, and reinvention - are, in fact, unlimited. "

David Grinspoon

" The basic ability to not wipe oneself out, to endure, to use your technological interaction with the world in such a way that has the possibility of the likelihood of lasting and not being temporary - that seems like a pretty good definition of intelligence. "

David Grinspoon

" We're going to stop looking at Earth from orbit because we don't like what we are seeing and the conclusions that leads us to? That's nonsense. "

David Grinspoon

" If you were on the surface of Venus, assuming you could see the Sun, which, you know, would be hard because it's so cloudy there, but the Sun would actually rise in the west and set in the east. And, it would do so very, very slowly, because the planet rotates incredibly slowly. "

David Grinspoon

" I will defend the NASA Earth Science Division with everything I've got. "

David Grinspoon

" I think chemists always think they know more than they know, because nature has a lot of possible pathways it can try. "

David Grinspoon

" There is a real danger of unintended consequences, of encouraging people to give up. Pessimism, if it becomes a habit, can reinforce a narrative of unstoppable decline. If there is nothing we can do, that releases us from our obligations. "

David Grinspoon

" When you think about alien intelligences making art, you then have to think about what art is and how bound up it is in the nature of consciousness. Why do we make art? And what can we expect to have in common with other creatures in universe? "

David Grinspoon

" I'm an astrobiologist, and I come from a planetary science background, so in a very broad sense, I study the evolution of planetary environments. "

David Grinspoon

" As a kid, I became a total SF geek. It started in the 5th grade with Asimov's 'Lucky Starr' series of what would now be called 'young adult' novels of adventures in the solar system. "

David Grinspoon

" The more we look at the kinds of soils and the nature of the atmosphere and the polar caps, it all adds up to tell us that some liquid, which we very much believe was water, did flow in abundance on Mars in the past. "

David Grinspoon

" The mature Anthropocene begins when we acquire the ability to live sustainably and become a lasting presence on this world. "

David Grinspoon

" Among the plausible niches for extraterrestrial life in our solar system, the clouds of Venus are among the most accessible and the least well explained. "

David Grinspoon

" Earth is a stunningly lovely planet for so many reasons. Among these is the wondrous presence of curious, artful, inventive humanity. "

David Grinspoon

" In order to have a decent chance to be a communicating species, you would have to learn to think and plan and act over time scales of a century or a millennium. "

David Grinspoon

" Humans are possessed, to some degree, with the power of foresight. Yet we so often learn things the hard way, through disaster. "

David Grinspoon

" Even cynical, selfish people will realize, one way or the other, that it's not in their self-interest to act in self-destructive ways. "

David Grinspoon

" I think the best SF writers are very aware of what we, in the scientific community, are doing, thinking, and discovering. "

David Grinspoon

" It's quite possible there's as much lightning on Venus as on Earth. "

David Grinspoon

" We can look out on an alien landscape that no one has seen before and find it beautiful. "

David Grinspoon

" My high-school friends and I felt part of a community of smart, forward-looking space and technology freaks. "

David Grinspoon

" We definitely don't want to go through another Ice Age or another natural cycle of global warming. Both happen over a long period of time. It would be disastrous for our civilization, and not just for us but many other species. "

David Grinspoon

" It's one of the big mysteries about Venus: How did it get so different from Earth when it seems likely to have started so similarly? The question becomes richer when you consider astrobiology, the possibility that Venus and Earth were very similar during the time of the origin of life on Earth. "

David Grinspoon

" It's quite possible that the end of us will not be the end of the Earth. Even if we really screw things up and things go badly for us and our civilization, the Earth is pretty resilient. "

David Grinspoon