Luboš Motl with some basic facts about CO2 exposure

iMatter: Your house is uninhabitable for most species

iMatter March, a children’s astroturf climate activist organization that will organize a march of broken glass between 7th and 14th of this month, has released their research about the end of the world in 2050:

Scientists that dedicate their entire lives to studying this, have made it clear: to avert the worst effects of climate change, the levels of CO2 in the atmosphere need to be at 350 parts per million (ppm). Right now we are at 391ppm. If we keep burning at the rate we are now, we will be at 500ppm by 2050. This would make earth a completely different planet, uninhabitable for most species. We can’t let that happen.

Oh, really? In that case, we must be careful about our puppies, kittens, and other pets not to get into our house, to protect their life. The reality is that 500 ppm is totally harmless for all known species on the planet – and actually well below the average concentrations we experience in our everyday life. (The Reference Frame)