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It’s clear that we are going to need fossil fuels for many decades. The political and legal establishments are engaged in fantasy policymaking. They are dangerously deluded.

—  Andrew Montford - Net Zero Watch director - Jun 2024

We must free itself from the illusion that international climate policy is environmental policy. This has almost nothing to do with environmental policy, with problems such as forest death or ozone hole.

...we are de facto redistributing world wealth.

—  Prof. Dr. Ottmar Edenhofer is Director of the Mercator Research Institute on Global Commons and Climate Change (MCC) | Neue Zürcher Zeitung, 14 Nov 2010
Translated article and context

The major difficulty in accepting this theory has been the absence of observed warming coincident with the historic CO2 increase. In fact, the temperature in the Northern Hemisphere decreased by about 0.5°C between 1940 and 1970, a time of rapid CO2 buildup.

The time history of the warming obviously does not follow the course of the C02 increase, indicating that other factors must affect global mean temperature.

—  James Hansen - NASA Goddard Institute for Space Studies (GISS)

Global warming is part of natural cycle and there's nothing we can actually do to stop these cycles. The world is now facing spending a vast amount of money in tax to try to solve a problem that doesn't actually exist.

—  David Bellamy

There are three things you need to know to know that [the climate emergency] is false.

First, it is not too hot now. It is one of the coldest periods in the history of the Earth.

Second, CO2 is lower now in the atmosphere than it has been throughout nearly the entire history of the Earth.

And the third thing you need to know is that all the CO2 that we are putting into the atmosphere, where did it come from? How did it get in the fossil fuels? By plants pulling it out of the atmosphere, and the oceans. The plankton in the sea, the vegetation on the land, turned into coal, oil and gas.

So all we're doing is replacing carbon dioxide... If there wasn't enough CO2 for the plants, we would all die too... We are replenishing the CO2 to a much better level than it had gone down to. We are the actual salvation of life on Earth.

—  Dr. Patrick Moore, Greenpeace co-founder

I would rather have questions that can't be answered than answers that can't be questioned.

—  Richard P. Feynman

It would be absurd to adopt policies which would bankrupt the industrial nations, or doom the poorer countries to increasing poverty.

— Margaret Thatcher, speech to the 2nd World Climate Conference

 An error does not become truth by reason of multiplied propagation, nor does truth become error because nobody sees it.

— Mahatma Gandhi

Analysis of warming since 1881 shows most of the increase in global temperature happened before 1919 — before the more re-cent sharp rise in the amount of carbon dioxide in the atmosphere.

While global climate warmed overall since 1881, it actually cooled from 1921 to 1979, Karl said

— Thomas Karl, of the National Oceanic and Atmospheric Administration’s National Climatic Data Center in Asheville, N.C. 

It is of course, the global warming scam, with the (literally) trillions of dollars driving it, that has corrupted so many scientists, and has carried APS before it like a rogue wave. It is the greatest and most successful pseudoscientific fraud I have seen in my long life as a physicist.

— Professor Harold Lewis, University of California, Santa Barbara

Science, however, is never conducted as a popularity contest, but instead advances through testable, reproducible, and falsifiable theories.

— Michio Kaku 

I'm sure you agree--the Mann/Jones GRL paper was truly pathetic and should never have been published.

— Raymond S. Bradley, Director, Climate System Research Center, University of Massachusetts

Not only do journalists not have a responsibility to report what skeptical scientists have to say about global warming, they have a responsibility not to report what these scientists say.

— Ross Gelbspan, former editor of The Boston Globe

Mike, the figure you sent is very deceptive [...] there have been a number of dishonest presentations of model results by individual authors and by IPCC

— Tom Wigley, University Corporation for Atmospheric Research, USA

I think if we don't overthrow capitalism, we don't have a chance of saving the world ecologically.

— Judi Bari, Earth First! Member

There is no individual model that does well in all of the SST [sea surface temperature] and water vapor tests we've applied.

— Ben Santer, Lawrence Livermore National Laboratory, USA

A global warming treaty must be implemented even if there is no scientific evidence to back the [enhanced] greenhouse effect.

— Richard Benedick, deputy assistant secretary of state, USA

I would freely admit that on global warming we have crossed the boundary from news reporting to advocacy.

— Charles Alexander, Time magazine science editor

We've got to ride the global-warming issue. Even if the theory of global warming is wrong, we will be doing the right thing, in terms of economic policy and environmental policy.

— Timothy Wirth, Clinton Administration Under Secretary of State

The minute you begin to believe your own hypothesis, you’re a dead duck as a scientist.

— Frank Beales - former U. of Toronto Professor