I (and many others) think the amount of cosmic rays that reach the earths atmosphere is the real cause of climate change. I agree there has been some warming (around 1 degree C) due to human activity like deforestation and urbanization but the biggest impact on climate looks to be from the amount of cosmic rays reaching the earths atmosphere.
Cosmic rays ionize the atmosphere which water droplets then condense on. A decrease in cosmic rays will lead to less ions for water droplets to condense on and a reduction in cloud cover, less clouds allow for more heating of the earth. A increase in cosmic rays will lead to more ions for water droplets to condense on and a increase in cloud cover, more clouds allow for more cooling of the earth. The amount of cosmic rays that reach the earths atmosphere are mostly determined by the earths magnetic field. The two main things that impact the earths magnetic field are Sunspot activity and Milankovitch orbital cycles.
The only computer climate models that have been able to go back in time and successfully forecast global warming/cooling have been based on Milankovitch orbital cycles and Sunspot activity, NOT CO2. CO2 has long been a theory of climate change, increased CO2 in the atmosphere has been shown to follow the warming rather than drive it.
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