We are frightened that once it has gone we won't get anything like it for tens of years.
True, we have a lot more choices (often aided by technology) about precisely how we do these things in the modern world but we are still built by a hundred thousand years or so of our own species, tens of millions of years of mammalian evolution, into ending up with slightly different brains and slightly different interests to go along with our very different gonads.
Even if we stop emissions now, acidification will last tens of thousands of years.
Over the past 38 years, tens of thousands of scientists have actively taken part in IGCP projects.
Even after tens of millions of years it still comes down to dollars.
It's the first time in tens of millions of years that these predators have appeared that close to Antarctica.
Here, ancient boulders spring leaks to release water that has been trapped within for tens of thousands of years.
They're retrieving a record of how the ice sheets have been behaving over the last tens of millions of years.
They contain thousands to millions of stars packed into a region of space just a few tens of light-years across.
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Fossil evidence suggests some populations could have been around tens of thousands of years ago, long before the emergence of agriculture.
If we lost one and it took that tens of thousands of years to get here, how fast is this happening?
That is because for tens of millions of years the greatest collision of all between the earth's plates has been happening there.
The protoplanet would take tens of thousands of years to grow up.
This band also contains several layers of a mineral called glauconite, each of which would have taken tens of thousands of years to form.
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The Navy will spend three years and tens of millions of dollars removing the ship's radioactive fuel and reactors before cutting it into scrap.
But archaeologists are still puzzling over what pushed humans to abandon a way of life that they had led for tens of thousands of years.
That sometime in the next few tens of millions of years there will be a large asteroid strike on this planet that we currently inhabit.
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Any interchange between the two, if it were possible, would have happened already in geologic time, measured in tens of millions of years, not in recent history.
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The apology will carry much broader symbolic meaning for a people whose forebears occupied Australia for tens of thousands of years before the British claimed it in 1788.
In the following years, tens of thousands of Chinese blasted tunnels through the Sierra Nevada, with great loss of life, to build the western arm of the transcontinental railway.
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More than 50 million years ago, undersea landslides resulted in the release of methane gas from methane hydrate, which contributed to global warming that lasted tens of thousands of years.
In other words, the evidence that Dr Nichols cites in support of the claim that the Americas have been populated for tens of thousands of years may actually support the view that they have not been.
"There are similar waters in South Africa with almost identical chemistry that are tens of millions of years old, and they contain microbes that have adapted to that environment, " explained Prof Chris Ballentine from Manchester University.
The effort, echoing "Jurassic Park", won't bring back dinosaurs -- their DNA didn't survive the tens of millions of years since they disappeared -- but aims to " de-extinct" such species as the passenger pigeon, declared extinct in 1914.
You'll save a half a billion dollars over 10 years and create tens of thousands of jobs.
If this is true, there's no reason those mechanisms should take four years or cost tens of thousands of dollars.
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And what if the waste produced by such a reactor was radioactive for a mere few hundred years rather than tens of thousands?
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By some estimates, it may take ten years, and tens of billions of dollars, before hard-hit areas like the Jersey Shore start to resemble their pre-Sandy outlines.
It is at its largest once every 12 years when it attracts tens of millions of people.
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