Scientists who questioned mankind’s impact on climate change have received death threats and claim to have been shunned by the scientific community.

They say the debate on global warming has been “hijacked” by a powerful alliance of politicians, scientists and environmentalists who have stifled all questioning about the true environmental impact of carbon dioxide emissions.

Richard Lindzen, professor of Atmospheric Science at Massachusetts Institute of Technology recently claimed: “Scientists who dissent from the alarmism have seen their funds disappear, their work derided, and themselves labelled as industry stooges.”