the pre-industrial level of co2 in the atmosphere in ppmv is about 260 -- 280 ppmv.
the pre-industrial level of co2 in the atmosphere in ppmv is about 260 -- 280 ppmv.
the pre-industrial level of co2 in the atmosphere in ppmv is about?
260 -- 280 ppmv
Na
Na
ar5 also projects changes in climate beyond the 21st century. the extended rcp2.6 pathway assumes sustained net negative anthropogenic ghg emissions after the year 2070. "negative emissions" means that in total, humans absorb more ghgs from the atmosphere than they release. the extended rcp8.5 pathway assumes continued anthropogenic ghg emissions after 2100. in the extended rcp 2.6 pathway, atmospheric co concentrations reach around 360 ppmv by 2300, while in the extended rcp8.5 pathway, co concentrations reach around 2000 ppmv in 2250, which is nearly seven times the pre-industrial level.
representative concentration pathway