Global warming alarmists base their scenarios of doom on the contemplation of a doubling of atmospheric CO2. However, responsible scientists realize the impossibility of doubling atmospheric CO2. Simply, we will not have enough hydrocarbons available to burn in the time frames the alarmists envision. Both fossil fuel emmissions and atmospheric CO2 will peak before 2100, and atospheric CO2 will only reach about 500 ppm, a 32% increase over the present 380 ppm.
As the farmer in the field replied when the city slicker asked directions to New York City, "You can't get there from here."