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" 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

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" What if life is not carbon-based? Can life exist as a gas or a plasma? Could planets or stars in some sense be alive? What about an interstellar cloud? Could life exist on such a small or large scale, or move so fast or so slowly that we wouldn't recognize it? Could you have an intelligent virus? "

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

" I do comparative studies of climate evolution, and the interactions between planetary atmosphere and surfaces and their radiation environment, and try to understand the environmental factors that can affect a planet's habitability and how they change over time. "

David Grinspoon

" 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

" It is said that Mahatma Gandhi, when asked about Western civilization, remarked, 'I think it would be a good idea.' That's how I feel about intelligent life on Earth, especially when I think about the question of what truly intelligent life might look like elsewhere in the universe. "

David Grinspoon

" Seriously, we should start taxing churches and have tax-exempt places for worship and study of nature and art. Charge ten bucks for Sunday services and make the Botanic Gardens free. "

David Grinspoon

" We don't know that Venus had oceans, but there's every reason to believe it did. "

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

" 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

" Literally, my earliest memory, my earliest vivid memory, is the Apollo 11 landing on the Moon. Yeah, I was in fourth grade, and I was just so captivated. And I think you'll find a lot of space scientists of my generation will say the same thing. Apollo was a big event for them. "

David Grinspoon

" It turns out one of my dad's best friends was Carl Sagan when I was little. They were both Harvard professors. "

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

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

David Grinspoon

" As long as we can imagine a better path, of course we are obligated to seek it. This is why unwarranted pessimism about our future is actually irresponsible. "

David Grinspoon

" We need to have a vision of the world we want to create so that we can see ourselves as collaborators with future generations in the project of shaping it. "

David Grinspoon

" Fixing global warming is more important than astronomy. "

David Grinspoon

" 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

Take For Granted

" The future peopling of Mars is much more than a scientific endeavor. It is a step of historic and spiritual importance for the human race. "

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 think Pluto has to be considered among the places in the solar system that are possible homes for life. "

David Grinspoon

" NASA, and all the other spacefaring nations of the world, have agreed to a set of 'planetary-protection' principles, aimed at preventing the accidental contamination of another habitable world with organisms from Earth. "

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

" I'm a strong advocate of new missions to Venus. "

David Grinspoon

" What I wonder most about the Anthropocene is not when did it start - but when, and how, will it end? Will it end? Or is it possible that our own growing awareness of our role on Earth can itself play a pivotal role in shaping the outcome toward one that we would desire? "

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

" The story of our species is one of overcoming existential risk through new forms of cooperation and innovation. "

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

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

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

" 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