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If you represent the Earth's lifetime by a single year, say from January when it was made to December, the 21st-century would be a quarter of a second in June - a tiny fraction of the year. But even in this concertinaed cosmic perspective, our century is very, very special: the first when humans can change themselves and their home planet.
Martin Rees
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Interpretation

What this quote means

Humans have reached a point where they can influence both themselves and the Earth significantly.

This quote by Martin Rees highlights the minuscule amount of time that human existence occupies in the vast timeline of Earth, yet emphasizes the uniqueness of this century. It suggests that in this brief moment, humanity has acquired the unprecedented ability to alter not only its own future but also the future of the planet, which carries immense responsibility and potential.

Themes

EarthHumanityChangeCenturyResponsibility

In practice

Example use cases

In a discussion about climate change and humanity's role, this quote could emphasize our unique position in history.

More from Martin Rees

The scientists who attack mainstream religion, rather than striving for peaceful coexistence with it, damage science, and also weaken the fight against fundamentalism.
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Let me say that I don't see any conflict between science and religion. I go to church as many other scientists do. I share with most religious people a sense of mystery and wonder at the universe and I want to participate in religious ritual and practices because they're something that all humans can share.
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It's becoming clear that in a sense the cosmos provides the only laboratory where sufficiently extreme conditions are ever achieved to test new ideas on particle physics. The energies in the Big Bang were far higher than we can ever achieve on Earth. So by looking at evidence for the Big Bang, and by studying things like neutron stars, we are in effect learning something about fundamental physics.
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In the beginning there were only probabilities. The universe could only come into existence if someone observed it. It does not matter that the observers turned up several billion years later. The universe exists because we are aware of it.
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Collective human actions are transforming, even ravaging, the biosphere - perhaps irreversibly - through global warming and loss of biodiversity.
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It is astonishing that human brains, which evolved to cope with the everyday world, have been able to grasp the counterintuitive mysteries of the cosmos and the quantum.
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