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Can you back up your ‘common misconception’ statement? I must be commonly misconceived, because I thought when we reach +3, it cascades into +5 because of methane sinks below permafrost at which point the ocean acidifies and heats making it inhospitable for phytoplankton and oxygen production falls.
This ignores the interdependence of humans with other species including plants. I still find your optimism unfounded. It also fails to address ocean acidification leading to a loss in oxygen production.