Sentences with phrase «exceeding dangerous global warming»

Not exact matches

Karlsson also refers to «natural variability during the Cambrian», but fails to inform his readers that at that time atmospheric carbon dioxide levels exceeded the pre-industrial level of 280 ppm by 15 - times (yes, fifteen times) without any known parallel dangerous global warming.

Although there is considerable scientific evidence that limiting warming to 1.5 degrees C is necessary to prevent very dangerous warming, a fact implicit in the recent Paris Agreement in which nations agreed to work to keep warming as close as possible from exceeding 1.5 degrees C additional warming, if the international community seeks to limit warming to 2 degrees C it must assure that global emissions do not exceed the number of tons of CO2 emissions that will raise atmospheric concentrations to levels that will cause warming of 2 degrees C.

The actual amount of emissions reductions that are needed between now and 2020 is somewhat of a moving target depending on the level of uncertainty that society is willing to accept that a dangerous warming limit will be exceeded, the most recent increases in ghg emissions rates, and assumptions about when global ghg emissions peak before beginning rapid reduction rates.

Indeed, the market conditions and policies necessary to make the tar sands a cost - effective source of energy will almost certainly result in dangerous levels of global warming that will exceed two degrees Celsius, the internationally agreed upon limit that will prevent climate change from destroying the planet.