Additional global warming in the next 50 y, if business - as - usual fossil fuel emissions continue, is expected to be at least 1 °C (4). (pnas.org)
Other things being «normal», it is the peak CO2 amount in a scenario (1) that would keep additional global warming from exceeding 1 °C (1.8 °F). (giss.nasa.gov)
Implications include (i) the expectation of additional global warming of about 0.6 °C without further change of atmospheric composition; (ii) the confirmation of the climate system's lag in responding to forcings, implying the need for anticipatory actions to avoid any specified level of climate change; and (iii) the likelihood of acceleration of ice sheet disintegration and sea level rise. (science.sciencemag.org)