What causes global warming? Low Cloud Cover is the key from recent NASA, Finish and Japanese studies. New evidence suggests that high-energy particles from space known as galactic cosmic rays affect the Earth’s climate by increasing cloud cover, causing an “umbrella effect”.

https://www.academia.edu/39359172/What_causes_global_warming_Low_Cloud_Cover_is_the_key_from_recent_NASA_Finish_and_Japanese_studies._New_evidence_suggests_that_high-energy_particles_from_space_known_as_galactic_cosmic_rays_affect_the_Earth_s_climate_by_increasing_cloud_cover_causing_an_umbrella_effect_