""Normally," says Volk, "the biosphere is like an upside-down glass jar: On top, it's basically closed to any extra matter, except for letting in a few meteors. At the bottom, the lid is slightly open - to volcanoes."
The problem is, by tapping into the Carboniferous Formation and spewing it up into the sky, we've become a volcano that hasn't stopped erupting since the 1700s."
- Alan Weisman in "The World WIthout Us".
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