20th century Quote by Willie Soon

It's likely that CO2 has some warming effect, but real proof of that hypothesis is tricky. You have to confirm by observation exactly how…

— Nigel Calder

... For nearly a decade now, there has been no global warming. Even though atmospheric CO2 has continued to accumulate - up about 4…

— Walter Cunningham

Changes in clouds and rainfall can overwhelm what little effect CO2-water vapour has on temperature.

— Willie Soon

The atmospheric CO2 concentration is rising - mainly due to the burning of fossil fuels. It's agreed that this build-up will, in itself, induce…

— Martin Rees

“CO2 had increased due to human activities, CO2 will continue to increase unless changes are made, and these increases will affect weather, agriculture, and…

— Naomi Oreskes

... The reality is that atmospheric CO2 has a minimal impact on greenhouse gases and world temperature. Water vapor is responsible for 95 percent…

— Walter Cunningham

I am not a global warming sceptic. I accept that rising human-caused CO2 from fossil sources could 'change the climate'. The basic physics is…

— Chris de Freitas

It seems that, notwithstanding the dramatic increases in manmade CO2 emissions over the last decade, the world's warming has stopped.

— Tony Abbott

CO2 emissions have been increasing, but the rise in air temperature stopped around 2001. Climate change is due in large part to naturally occurring oscillations.

— Syun-Ichi Akasofu

There is no proof that carbon dioxide is causing or precedes global warming....All indications are that the minor warming cycle finished in 2001 and…

— John Williams

“The retreat of the Arctic sea ice, the warming of the oceans, the rapid shrinking of the glaciers, the redistribution of species, the thawing…

— Elizabeth Kolbert

“Why have global temperatures not risen in the best part of two decades while CO2 levels have kept on rising? •    ”

— Alan Carlin