Life as a whole will not go extinct with higher levels of carbon dioxide, but humanity will get a beating. Losing all our sea ports, many of our biggest cities, over 30% of all fertile land (which produces close to 50% of our food, as the muddy flood planes are excellent farming ground). And it could happen within a century.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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