Lord Lawson falsely claims that global temperatures have declined over last decade

CLAIM
"according, again, to the official figures—during this past 10 years, if anything, mean global temperature, average world temperature, has slightly declined"

SOURCE: Nigel Lawson, BBC, 10 Aug. 2017

VERDICT

Earth is not at risk of becoming a hothouse like Venus, as Stephen Hawking claimed

CLAIM
"Trump's action could push the Earth over the brink, to become like Venus, with a temperature of two hundred and fifty degrees, and raining sulphuric acid."

SOURCE: Stephen Hawking, BBC, 2 July 2017

VERDICT

Energy Secretary Rick Perry incorrectly claims CO2 is not primary cause of climate change

CLAIM
"Most likely the primary control knob [on climate change] is the ocean waters and this environment that we live in."

SOURCE: Rick Perry, CNBC, 19 June 2017

VERDICT

Breitbart falsely claims 58 studies refute human-caused global warming

CLAIM
"'Global warming' is a myth — so say 80 graphs from 58 peer-reviewed scientific papers published in 2017."

SOURCE: James Delingpole, Breitbart, 6 June 2017

VERDICT

Natural variability can not explain modern global warming, as Heartland Institute report claims

CLAIM
"Neither the rate nor the magnitude of the reported late twentieth century surface warming (1979–2000) lay outside normal natural variability."

SOURCE: Craig Idso, Robert Carter, S. Fred Singer, Heartland Institute, 2016

VERDICT

A lull in solar activity would have little effect on global temperatures; claims of “global cooling” are not based on science

CLAIM
"Forward projections of solar cyclicity imply the next few decades may be marked by global cooling rather than warming, despite continuing CO2 emissions."

SOURCE: Craig Idso, Robert Carter, S. Fred Singer, Heartland Institute, 2016

VERDICT

Global warming has not “ceased”, as Heartland Institute report falsely claims

CLAIM
"global warming ceased around the end of the twentieth century and was followed (since 1997) by 19 years of stable temperature"

SOURCE: Craig Idso, Robert Carter, S. Fred Singer, Heartland Institute, 2016

VERDICT

CO2 is a greenhouse gas that caused warming during past climate changes, notably as a feedback amplifying other factors

CLAIM
"Increases in atmospheric CO2 followed increases in temperature. Therefore, CO2 levels could not have forced temperatures to rise."

SOURCE: Craig Idso, Robert Carter, S. Fred Singer, Heartland Institute, 2016

VERDICT

Heartland Institute report’s claim that climate models are too sensitive to CO2 does not reflect evidence

CLAIM
"[climate models] systematically over-estimate the sensitivity of climate to carbon dioxide ... and modelers exclude forcings and feedbacks that run counter to their mission"

SOURCE: Craig Idso, Robert Carter, S. Fred Singer, Heartland Institute, 2016

VERDICT

Heartland Institute report incorrectly claims no evidence of human impacts in melting ice

CLAIM
"Melting of Arctic sea ice and polar icecaps is not occurring at ‘unnatural’ rates and does not constitute evidence of a human impact on the climate."

SOURCE: Craig Idso, Robert Carter, S. Fred Singer, Heartland Institute, 2016

VERDICT