YouTube puts context label on GOP presidential candidate Nikki Haley’s video: YouTube imposed a fact-checking label on presidential candidate Nikki Haley’s Jun. 8 video, “Nikki Haley on Climate Change.” 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.