Stephen Hawking — "We are in danger of destroying ourselves by our greed and stupidity."
We are in danger of destroying ourselves by our greed and stupidity.
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More from Stephen Hawking
"The universe is not expanding into anything."
"The universe is not only stranger than we imagine, it is stranger than we can imagine."
"I think that the human race has a future, but it's going to be a challenging one."
"I want my books sold on airport bookstalls."
"Look up at the stars and not down at your feet. Try to make sense of what you see, and wonder about what makes the universe exist. Be curious."
About Stephen Hawking (1942-2018)
British theoretical physicist whose Hawking radiation work and A Brief History of Time (1988) brought black-hole physics to a mass audience while he lived with ALS for 55 years. Closely associated with Roger Penrose (his collaborator on singularity theorems) and Carl Sagan (fellow popularizer who wrote Brief History's foreword). For an intellectual contrast, see William Lane Craig, American philosopher of religion — Craig's Kalam cosmological argument depends on the Big Bang requiring a divine first cause; Hawking's no-boundary proposal was specifically designed to remove the moment that would require one — the cleanest cosmology-vs-natural-theology contrast in modern thought.
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Understanding this quote
What it means
Humanity's greatest existential threat isn't an asteroid or alien invasion—it's our own behavior. Greed drives environmental destruction, resource overconsumption, and prioritizing short-term profit over long-term survival. Stupidity means collectively ignoring clear scientific warnings about climate change, nuclear war, and pandemic risk. The quote's weight comes from its implication: these dangers are self-inflicted and therefore preventable. We possess the knowledge to survive but repeatedly choose comfort and profit over rational collective action.
Relevance to Stephen Hawking
Hawking spent decades warning about existential threats beyond cosmology—AI, climate change, nuclear war, engineered pandemics. He famously estimated humanity had roughly 1,000 years to escape Earth before self-destruction. Living 55 years with ALS gave him direct experience of biological fragility. His study of black holes—regions of ultimate irreversible destruction—deepened his intuition about catastrophic endpoints. He believed science held answers, but only if humanity chose reason over greed and political short-termism.
The era
Hawking issued these warnings amid accelerating climate crisis, nuclear proliferation resurgence, and the 2008 financial collapse exposing systemic greed at civilization scale. The IPCC had been sounding climate alarms since 1988, yet emissions kept rising. The Cold War's end briefly raised hopes, but inequality widened, resource conflicts multiplied, and carbon output grew. His era saw unprecedented scientific consensus on existential risks paired with equally unprecedented political failure to act on any of them.
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