The decisive explanation for the globally increasing mean surface temperatures that centers human activities as a main cause is related to paleoclimatic data and astronomical facts as natural driving forces for climate changes.
Historical warming and cooling phases have been characterised by greenhouse gas variations and positive feedbacks which today are feared to have the potential to irreversibly worsen preconditions for life on Earth.
The actual warming trend needs not necessarily be continued as predicted in the most common climate models since there are possible indicators for a future reversal based on e.g. recessive solar activity, Earth’s eccentricity, and changes in ocean currents.
Taken together on a short time scale positive feedbacks indicate further warming but on a longer time scale extraterrestrial factors are likely to prevail, leading to a naturally caused cooling trend in the future.
The big picture that is drawn here shows regulation mechanisms even beyond the biosphere, letting CO2 emissions appear less dominating over the Earth’s climate.