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I'm not saying all of the Cambrian CO2 is in our oil and coal reserves. But a lot is, and any change to the environment will cause mass extinction. This is just the first time it has been caused by a single species in such a short anount of time, and since we know about it, it is our duty to rememedy it as moral beings, instead of sticking our proverbial heads in the sand and hope it goes away by itself.
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Or, of course, a small group could leave Earth and watch what happens, then use this as a warning for future generations.