When global warming occurred between 1920 and 1945 this was probably due to a hotter sun but the global warming since 1977 is most likely caused by greenhouse gases.
The global warming of the current era is most likely as a result of the increase in greenhouse gases in the atmosphere which are trapping the sun's heat.
This is different to the global warming between 1920 and 1945 which most likely happened because the sun was hotter and there weren't many volcanic eruptions.
Find out more on global warming at https://brainly.com/question/3553382.
