A.
Human caused emissions of green house gases started to rise during the pre-industrial age. It was driven by the growing economy and population. Future projections of emissions depend on socio-economic development, and on climate policy.
B.
Human caused emission of green house gases started to rise during mid 1950s. It was driven solely by the fossil fuel industry. Future projections of emission depend on socio-economic development.
C.
Human caused emission of green house gases started to rise during the pre-industrial age. It was driven by a growing number of middle-income countries. Future projections of emission depend on climate policy.
D.
Human caused emission of green house gases started to rise during the pre-industrial age. Mainly a growing economy and a growing population drives it. Future projections of emission depend only on socio-economic growth.