When he's asked for the evidence of irreversible climate change and then the other side goes silent. (climatedepot.com)
It is based on when most of the globe will be exposed to potentially irreversible climate changes. (scientificamerican.com)
I would argue that CO2 emissions ought to be very strongly decreased, ideally close to zero, to avoid irreversible climate change. (climatechangenationalforum.org)