The size of that carbon footprint

Luboš Motl has a chart that provides a bit of perspective on atmospheric carbon dioxide. See iMatter: Your house is uninhabitable for most species. The concentration that is causing worry today is less than half that usually encountered in a kitchen. The level expected as catastrophic is still quite a bit less than usually found in a living room.

The warming induced by the increase from 391 ppm to 500 ppm is smaller (by about 20%) – because of the logarithmic law – than the warming by the same 109 ppm between 282 ppm and 391 ppm which was about 0.7 °C and pretty much unnoticeable without accurate gadgets and contrived statistical methods.

Then there are the feedback mechanisms, which are poorly understood, that make prognistications based strictly on carbon dioxide levels quite suspect.

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