The cause of climate change

Howard Bloom:

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Why? What's the real cause of the Earth's norm—a climate that rocks back and forth from steamy tropical heat to icy freeze? A climate that deposits fossilized seashells on mountaintops and makes dry land into seas and swamps?

The Earth is a traveler. Its angle as it sweeps around the sun produces the massive weather flips we call seasons—the dance from summer to winter and back again. But there's more. Our planet has a peculiar wobble—its precession. And that precession produces upheavals in our weather, weather alterations we cycle through every 22,000, 41,000 and 100,000 years. This is called the Milankovich cycle, named for the Serbian engineer and geophysicist who discovered it.

But the wobbles in our trip around the sun are just a start. The sun is a traveler, too. It circles the black hole at the galaxy's core every 226 million years. And it takes its tiny flock of planets with it. That means us. The result?

The journey around the galactic core is fraught with dangers. For example, every 143 million years we pass through a spiral arm of the galaxy, an arm that tosses tsunamis of cosmic rays our way. Those rays produce massive climate change. Then there's the innocent-sounding stuff astronomers call galactic "fluff," massive clouds of cosmic dust lurking in our solar system's path that also cause dramatic climate change.

Meanwhile, the sun itself is going through a cycle from birth to death. As a result of its maturation, good old reliable sol is 43% warmer today than it was when the Earth first gathered itself into a globe of planetesimals 4.5 billion years ago.

The bottom line? Weather changes and the occasional meteor have tossed this planet through roughly 142 mass extinctions since life began 3.85 billion years ago. That's an average of one mass extinction every 26.5 million years. Where did these mass die-offs come from? Nature. There were no human capitalists, industrialists or cultures of consumerism to blame.

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Adapting to that change is what the strongest species do. No one has the power to stop those changes.