evidence: Despite the overwhelming evidence, it’s still common to see politicians, media commentators or social media users cast doubt on the role of humans in driving climate change. [...] The 2013 study examined 11,944 climate research papers and found almost one-third of them expressed a position on the cause of global warming. Of these 4,014 papers, 97% endorsed the consensus position that humans are the cause, 1% were uncertain, and 2% explicitly rejected it. [...] In reaching this conclusion, it is important to distinguish between changes caused by human activities altering the atmosphere’s chemistry, and climate variability caused by natural factors.