13 Aug '18, 2am

@srpeatling Abbott recites a thoroughly-debunked talking point:

Enginerd at 13:53 PM on 30 August, 2011 Thanks for this post. When talking to scientists, I typically use ozone in the stratosphere to deflate this argument, as it is also a case where "trace" amounts of a chemical in the atmosphere plays a vital role to life on Earth, and not due to direct exposure. The example works really well, though it is perhaps not as familiar to the general public. Also, I'm astounded by the argument that an increase of "only 100 ppm" cannot possibly be harmful. Having studied outdoor air quality for 20+ years, my experience has been that it's highly unusual to find part per *billion* level statistically significant changes in *local* outdoor air quality for many pollutants. But, a 100+ part per *million* increase in *global* pollution levels over this time frame? That's actually an astounding increase, in my experience. I usually remind people tha...

Full article: https://www.skepticalscience.com/CO2_is_a_trace_gas.html

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