Fact brief - Did CO2 contribute to early 20th century warming?

Fact brief - Did CO2 contribute to early 20th century warming?

Skeptical Science is partnering with Gigafact to produce fact briefs — bite-sized fact checks of trending claims. You can submit claims you think need checking via the tipline. Did CO2 contribute to early 20th century warming? Warming from 1920 to 1940 was influenced by both natural dynamics or “forcings” as well as human-caused greenhouse gas emissions such as CO2. Human-caused CO2 began rising during the Industrial Revolution and contributed t…