350 parts per million is what many scientists, climate experts, and progressive national governments are now saying is the safe upper limit for CO2 in our atmosphere.
Accelerating arctic warming and other early climate impacts have led scientists to conclude that we are already above the safe zone at our current 390ppm, and that unless we are able to rapidly return to 350 ppm this century, we risk reaching tipping points and irreversible impacts such as the melting of the Greenland ice sheet and major methane releases from increased permafrost melt.
Find an event near you to participate. (Das gibt’s auch auf Deutsch: Also auch in Deutschland an 350 Aktionen teilnehmen!)
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A big, scary question mark is ocean-floor hydrate. This is a compound of methane trapped in water ice. If the oceans warm a bit too much in some regions mega tons of methane could be released. Methane is a powerful green house gas. It has been suggested that the Permian exctintion could have been related to such an event.