260-270 is the value of the pre-industrial level of co2 in the atmosphere in ppmv based on more recent indirect data.
260-270 is the value of the pre-industrial level of co2 in the atmosphere in ppmv based on more recent indirect data.
based on more recent indirect data, what is the value of the pre-industrial level of co2 in the atmosphere in ppmv?
260-270
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