The real negotiation is between humans on the one hand and chemistry and physics on the other. And chemistry and physics, unfortunately, don't bargain.
— Bill McKibben on the International Climate Change Summit
Man has reached the point where his impact on the climate can be as significant as nature's.
— D. James Baker, administrator of the U.S. National Oceanic and Atmospheric Administration
I am a skeptic...Global warming has become a new religion.
— Nobel Prize winner for Physics, Ivar Giaever
Runaway greenhouse theories contradict energy balance equations.
— Miklós Zágoni, physicist and environmental researcher
I have spent a long research career studying physics that is closely related to the greenhouse effect...Fears about man-made global warming are unwarranted and are not based on good science....The earth's climate is changing now, as it always has. There is no evidence that the changes differ in any qualitative way from those of the past.
— Dr. Will Happer, Princeton physicist
It is a blatant lie put forth in the media that makes it seem there is only a fringe of scientists who don't buy into anthropogenic global warming.
— U.S Government Atmospheric Scientist Stanley B. Goldenberg of the Hurricane Research Division of NOAA
There is broad agreement within the scientific community that amplification of the Earth's natural greenhouse effect by the buildup of various gases introduced by human activity has the potential to produce dramatic changes in climate. Only by taking action now can we ensure that future generations will not be put at risk.
— Statement by 49 Nobel Prize winners and 700 members of the National Academy of Sciences, 1990
If we take all this actions and if it turns out not be true, we have reduced pollution and have better ways to live, the downside is very small. The other way around, and we don’t act, and it turns out to be true, then we have betrayed future generations and we don’t have the right to do that.
This time it is not an asteroid colliding with the Earth and wreaking havoc: it is us.
It used to be controversial whether smoking caused lung cancer, it used to be controversial whether HIV caused AIDS. Now, there are a few mavericks who deny those things.
— Lord Martin Rees, Royal Society president and Astronomer Royal of Great Britain
Global warming causing climate change may be the ultimate issue that unites us all.
— Louise Burfitt-Dons
These organizations argue that since carbon dioxide is a vital chemical for plant life, more of it can only be a good thing, and that any reduction in CO2 output would be harmful to the ecosystem and the economy. This is analogous to saying that blood is good for you as it supports your body's critical functions, so you should be in favor of having 500 gallons of blood forcibly injected into your veins.
Pack your shit, folks. We’re going away. And we won’t leave much of a trace, either. Maybe a little Styrofoam.
The absolutely best case scenario - which in my opinion is unrealistic - with the minimum expected climate change... we end up with an estimate of 9% [of all species] facing extinction.
— Chris Thomas, ecologist at the University of Leeds
Even doubling or tripling the amount of carbon dioxide will virtually have little impact, as water vapour and water condensed on particles as clouds dominate the worldwide scene and always will.
— Geoffrey G. Duffy, Chemicals and Materials engineering professor at the University of Auckland, New Zealand
Unless we stop dumping 70 million tons of global warming pollution into the atmosphere every 24 hours, which we are doing right now ... the continued acceleration of this pollution would destroy the future of human civilization.
— Al Gore, former U.S. vice-president and Nobel Peace prize winner
For how many years must the planet cool before we begin to understand that the planet is not warming? For how many years must cooling go on?
— Geologist Dr. David Gee, professor at Uppsala University, Sweden
"Future generations will wonder in bemused amazement that the early 21st century's developed world went into hysterical panic over a globally averaged temperature increase of a few tenths of a degree, and, on the basis of gross exaggerations of highly uncertain computer projections combined into implausible chains of inference, proceeded to contemplate a roll-back of the industrial age."
— Richard Lindzen, MIT
"We may have just passed a point of no return when it comes to Earth's climate. The low point of carbon dioxide in the atmosphere typically occurs around the last week of September. But this year, levels of late have failed to drop below 400 parts per million (ppm) – and it looks like they're not going to. Brief excursions towards lower values are still possible but it already seems safe to conclude that we won’t be seeing a monthly value below 400 ppm this year – or ever again for the indefinite future."
— Ralph Keeling, director of the Scripps CO 2 Program at the University of California-San Diego's Scripps Institution of Oceanography, when the carbon levels crossed a possibly irreversible threshold in 2016.