Coleman’s Full Open Letter is here:
He added: “There is no significant man-made global warming at this time, there has been none in the past and there is no reason to fear any in the future.
“Efforts to prove the theory that carbon dioxide is a significant greenhouse gas and pollutant causing significant warming or weather effects have failed.
“There has been no warming over 18 years.”
Climate expert William Happer, from Princeton University, supported Mr Coleman’s claims.
He added: “No chemical compound in the atmosphere has a worse reputation than CO2, thanks to the single-minded demonisation of this natural and essential atmospheric gas by advocates of government control and energy production.
“The incredible list of supposed horrors that increasing carbon dioxide will bring the world is pure belief disguised as science.”
In 2010 a high-level inquiry by the InterAcademy Council found there was “little evidence” to support the IPCC’s claims about global warming.
It also said the panel had purposely emphasised the negative impacts of climate change and made “substantive findings” based on little proof.