.Greenhouse effect (GE) = ~33°c as in the natural biosphere.
.Water vapour accounts for about 95% of GE= ~31.35°c
.Other Greenhouse gases GHG's account for 5%= ~1.65°c
.CO2 is 75% of GHG (methane and nitrous oxide included) = ~1.24°c
.Most CO2 in the atmosphere is natural, more than 93%
.Man made CO2 is less than 7% therefore contributes ~0.087°c
.UK contribution to the earth is 2% = .00174°c
.USA contribution is 20% = .0174°c or 18 thousandths of a degree