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Originally Posted by CFECO
Neil, How do we just "Stop" what we are doing, turn off the all the Power Plants and stop driving ICE powered vehicles
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That is the real question. We've left it too late to do it relatively painlessly. Doing what is required is now going to hurt. The later it is left, the more it's going to hurt.
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What was the result of those past changes, destruction of life on Earth...no.
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But there were very different forms of life/ecosystems on this planet when the atmospheric composition and global temperatures were different. We weren't there then and like the planet as it is now (give or take a bit). Life would be very difficult for us humans if the Earth were to be like it has been in the more distant past.
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If it has been hotter before from Natural causes, what would man do if it became hotter again by Natural causes, scream and yell and steal everyones money, to give to pie-in-the sky projects?
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"Life" is one of those natural causes. We are "life". I'll remind you that the only reason there is any O2 in the atmosphere and liquid H2O on the Earth's surface is because of biological activity.
One of the "natural causes" of previous climate change was the sequestration of Carbon from CO2 in the atmosphere, into the form of coal, oil and natural gas, by biological activity. That, naturally, altered the Earth's temperature and climate (it cooled).
With those higher than recent (preindustrial) levels of GHGs, Earth was a Hell hole, unsuitable for human life. Reverse the sequestration - our biological activity - and we go back to that Hell hole. It's that simple.