A very large portion, not all, not little. https://en.wikipedia.org/wiki/Solar_cycle#/media/File:Sunspot_Numbers.png https://en.wikipedia.org/wiki/Solar_cycle#

A very large portion, not all, not little. https://en.wikipedia.org/wiki/Solar_cycle#/media/File:Sunspot_Numbers.png https://en.wikipedia.org/wiki/Solar_cycle#/media/File:Sunspo... Notice the Modern Maximum starting around ~1800 which is also when all the graphs of global warming show increases; whereas normally the industrial revolution is blamed. Maunder minimum -> https://en.wikipedia.org/wiki/Little_Ice_Age https://en.wikipedia.org/wiki/Little_Ice_Age Medieval maximum -> https://en.wikipedia.org/wiki/Medieval_Warm_Period https://en.wikipedia.org/wiki/Medieval_Warm_Period though our data is far less clear about that period of time. Fundamentally, you can look at this graph. https://en.wikipedia.org/wiki/Geologic_temperature_record#/media/File:All_palaeotemps.svg https://en.wikipedia.org/wiki/Geologic_temperature_record#/m... The climate warms and cools quite regularly. The Earth warmed 6 celcius over the last 20,000 years without our help. https://en.wikipedia.org/wiki/Eemian https://en.wikipedia.org/wiki/Eemian about 115,000 years ago it was 1-2 celcius warmer. Which is roughly what is currently being predicted as part of climate change by 2100.