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" Radiation is one of the important factors in evolution. It causes mutation, and some level of mutation is actually good for evolution. "

David Grinspoon

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" We need visions of a future in which we have applied our infinite creativity to the task of living on a finite world, where we have embraced our role, become comfortable and proficient as planet-shapers, and learned to use our technological skills to enhance the survival prospects not just of humanity but of all life on Earth. "

David Grinspoon

" Humanity has at least a dim, and growing, cognisance of the effects of its presence on this planet. The possibility that we might integrate that awareness into how we interface with the Earth system is one that should give us hope. "

David Grinspoon

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

David Grinspoon

" You cannot study other planets without referring to Earth and without applying the techniques and the insights of Earth science. And you cannot really do a good job understanding the Earth without the insights from planetary exploration. "

David Grinspoon

" Fixing global warming is more important than astronomy. "

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

" Thinking about the new epoch - often called the Anthropocene, or the age of humanity - challenges us to look at ourselves in the mirror of deep time, measured not in centuries or even in millennia, but over millions and billions of years. "

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

" Even as our unwitting alterations to Earth's carbon and hydrological cycles slowly make storms more damaging, our ability to monitor our planet from space and make reliable short-term forecasts have equipped us enormously to withstand them. "

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

" Titan has rivers and lakes of liquid methane and ethane, methane weather systems of clouds and storms that mirror Earth's hydrologic cycle, and seasonal cycles that rival Earth's in complexity. "

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

" 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

" Astrobiology is the science of life in the universe. It's an attempt to scientifically deal with the question of whether or not we're alone in the universe, looking at the past of life, the present of life, and the future of life. It's an interdisciplinary study incorporating astronomy, biology, and the Earth sciences. "

David Grinspoon

" The hallmark of the human species is great adaptability. "

David Grinspoon

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

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

" Mars does not belong to 'America,' nor to Earth, nor to human beings. "

David Grinspoon

" As a young planet, Venus was losing hydrogen rapidly to space. The oceans boiled off, and after some period of time, perhaps 600 million years, there was no surface water. "

David Grinspoon

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

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

" 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

" There's no question to my mind that saving our civilization and many other species is more important than our ability to do ground-based astronomy for a few decades. "

David Grinspoon

" If we gutted NASA Earth Science, it wouldn't be NOAA or some other agency that would take the lead. It would be the Chinese and the Europeans and the Japanese. "

David Grinspoon

" A lot of the science fiction that I grew up reading was written when we still thought that Venus might be an oceanic planet. "

David Grinspoon

" We're going to get off fossil fuels, no question. We may not do it quickly enough to avoid some pain, and I'm quite worried about that. But by the 22nd century, there's no way we'll be on fossil fuels. "

David Grinspoon

" I don't see it as coincidence that the great acceleration of the Anthropocene influences on Earth came during the same decades as our first exploration of the other planets. "

David Grinspoon

" 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

" I'd been politically active ever since my parents wheeled me in a stroller in a 'ban the bomb' march in Boston in 1963. "

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