YouTube puts context label on Democrat presidential candidate Marianne Williamson’s video: YouTube imposed a fact-checking label on presidential candidate Marianne Williamson’s Apr. 18 video, “Climate Change Is The Great Moral Challenge Of Our Generation.” YouTube put a context label that linked to the United Nations and claimed, “Climate change refers to long-term shifts in temperatures and weather patterns, mainly caused by human activities, especially the burning of fossil fuels.” A 2022 study found that atmospheric CO2 from fossil fuels was too low to cause global warming.