Temperature surface, global increase

Atmospheric warming is presently occurring. Global surface air temperature has probably increased by roughly 0.8°C over the last century. This warming is probably being transferred to the ocean in a manner comparable to chemical tracers that have been observed, which means... 

In order for ecopoiesis to be possible, four principal modifications must be applied to the Martian environment (1) mean global surface temperature must be increased by -60 K (2) the mass of the atmosphere must be increased (3) liquid water must be made available and (4) the surface UV and cosmic ray flux must be substantially reduced. 

Fig. 1 Global mean surface temperature evolution during the last century (observed) and projected for the next century. Bars on the right show the possible range of temperature increases from different AOGCM, and also from Simple Climate Models (SCM) and Earth Models of Intermediate Complexity (EMIC). Figure taken from IPCC [1]...

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