A survey of scientific papers by a team led by Mr Cook and published by Fairfax Media this week found more than 97 per cent of researchers endorsed the view that humans are to blame for global warming. The peer-reviewed outcome flies in the face of public perception in countries such as the US or Australia that scientists are divided on the issue. John Cook “One of the highest predictors of how important people think climate change is, is cues from political leaders,” Mr Cook said. “So if the leaders don't seem to care, people don't care either. “A cue from Obama is a big step,” he said. “The fact it goes to more than 31 million followers, it just raises the awareness of consensus.” That's 31,541,507 followers, to be precise. Retweets recently stood at 1,746 with Twitter carrying a long stream of comments.

'Crazy' day The peer-reviewed report also sparked international media interest, with CNN among the news outlets chasing Mr Cook. “It went crazy,” he said. “I've never experienced that before.” Mr Cook's timing was fortuitous. The Obama administration is battling Republicans in Senate who are opposed to the president's nomination of Gina McCarthy to lead the country's Environmental Protection Agency. Without sufficient Congressional support for a price on carbon, Mr Obama has used the EPA as his main tool for trying to reduce greenhouse gas emissions that are blamed for warming the planet.

Mr Cook said reports on the scientific consensus linking humans to climate change “tend to bounce around the echo chamber”. “Something like what Obama did really helps in getting that information out into the general public,” he said. Bullying While most of the interest has been positive, Mr Cook expects some negative attention from those who reject the scientific consensus – something that some academics have found to their dismay. “Generally the level of hate you get is in proportion to the impact you have,” he said.

Loading “There's an increase in academic bullying where climate deniers are sending complaints to journals or the university ... and this actually works. “I've have anecdotal examples of academics who are scared of that kind of reaction and who are playing things close to their chest – which is a real shame,” he said.