Our everyday lives are shaped by processes that vastly predate us, and our habits will in turn have consequences that will outlast us by generations. But spans of hundreds of years - the time a molecule of carbon dioxide resides in the atmosphere - approach the limits of our comprehension. The passage of nine days, which is how long a drop of water typically stays in Earth's atmosphere, is something we can easily grasp.
Few of us have any conception of the enormous timescales in our planet's long history, and this narrow perspective underlies many of the environmental problems we are creating for ourselves.
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