Haigh conforms to the mainstream scientific view, that anthropogenic carbon emissions lead to increased greenhouse warming. She stated in June 2016 that if current levels of carbon dioxide emissions continued unabated, they would lead to a 5 °C increase over pre-industrial climate by the end of the next century, and that achieving a zero temperature rise would require a complete cessation of carbon emissions. She also stated that she was optimistic about the future, following the COP21 conference, but later, when Donald Trump became president of the United States, she said: