Global warming is the increase in the average temperature of Earth's near-surface air and oceans since the mid-20th century and its projected continuation.
- [W]hen we look at the graphs of rising ocean temperatures, rising carbon dioxide in the atmosphere and so on, we know that they are climbing far more steeply than can be accounted for by the natural oscillation of the weather ... What people (must) do is to change their behavior and their attitudes ... If we do care about our grandchildren then we have to do something, and we have to demand that our governments do something.
- David Attenborough, naturalist
- When I was a boy in the 1930s, the carbon dioxide level was still below 300 parts per million. This year, it reached 382, the highest figure for hundreds of thousands of years.
- There's a better scientific consensus on this than on any issue I know -- except maybe Newton's second law of dynamics,
- D. James Baker, administrator of the U.S. National Oceanic and Atmospheric Administration.
- "One very simple truth about Global Warming is this, that it will spare nobody, however rich, mighty and powerful we think we are.... Mr Tony Blair, the Prime Minister of the UK once said that without proper action now, the average global temperatures would rise by 2 degrees Celsius. Scientists estimate that the subsequent rise in the sea level would be enough to swamp a large proportion of Bangladesh in 30/40 years time. It would be a serious catastrophe for my country and for the whole region if much of the land in Bangladesh disappears under the sea. I become frightened to think that my grand children (when I touch them) will have no place to live on this planet earth. I really want to be sure that my grandchildren, and their children after them, will be able to enjoy the beauty of my country that I have enjoyed, and be able to have enough land to live, and enough land for food."
- Michael S. Baroi, Anglican Bishop of Bangladesh 
- "Gordon Brown thinks you can solve climate change by changing your lightbulbs. I think you should solve climate change by changing the government"
- "Global warming is too serious for the world any longer to ignore its danger or split into opposing factions on it."
- The blunt truth about the politics of climate change is that no country will want to sacrifice its economy in order to meet this challenge.
- Climate change is one of the greatest challenges facing humanity, and it is the world’s most vulnerable populations who are most immediately at risk. The actions of the wealthiest nations—those generating the vast majority of greenhouse gases—have tangible consequences for people in the rest of the world, especially in the poorest nations.’
- Michael R. Bloomberg, Mayor of New York 
- "The danger is that global warming may become self-sustaining, if it has not done so already. The melting of the Arctic and Antarctic ice caps reduces the fraction of solar energy reflected back into space, and so increases the temperature further. Climate change may kill off the Amazon and other rain forests, and so eliminate once one of the main ways in which carbon dioxide is removed from the atmosphere. The rise in sea temperature may trigger the release of large quantities of carbon dioxide, trapped as hydrides on the ocean floor. Both these phenomena would increase the greenhouse effect, and so global warming further. We have to reverse global warming urgently, if we still can."
- Professor Stephen Hawking - ABC News interview, August 16, 2006[specific citation needed]
- A change in our climate however is taking place very sensibly. Both heats and colds are become much more moderate within the memory even of the middle-aged. Snows are less frequent and less deep. They do not often lie, below the mountains, more than one, two, or three days, and very rarely a week. They are remembered to have been formerly frequent, deep, and of long continuance. The elderly inform me the earth used to be covered with snow about three months in every year. The rivers, which then seldom failed to freeze over in the course of the winter, scarcely ever do so now. This change has produced an unfortunate fluctuation between heat and cold, in the spring of the year, which is very fatal to fruits. From the year 1741 to 1769, an interval of twenty-eight years, there was no instance of fruit killed by the frost in the neighbourhood of Monticello. An intense cold, produced by constant snows, kept the buds locked up till the sun could obtain, in the spring of the year, so fixed an ascendency as to dissolve those snows, and protect the buds, during their developement, from every danger of returning cold. The accumulated snows of the winter remaining to be dissolved all together in the spring, produced those overflowings of our rivers, so frequent then, and so rare now.
- "Man has reached the point where his impact on the climate can be as significant as nature's."
- Warrick, Joby. “Consensus Emerges Earth Is Warming – Now What?” Washington Post 12 Nov. 1997: A01.
- Still, is it fair to call climate denial a form of treason? Isn’t it politics as usual? Yes, it is — and that’s why it’s unforgivable ... Do you remember the days when Bush administration officials claimed that terrorism posed an “existential threat” to America, a threat in whose face normal rules no longer applied? That was hyperbole -- but the existential threat from climate change is all too real. Yet the deniers are choosing, willfully, to ignore that threat, placing future generations of Americans in grave danger, simply because it’s in their political interest to pretend that there’s nothing to worry about. If that’s not betrayal, I don’t know what is.
- “The planet will continue to cook.”
- Paul Krugman, Awake! magazine November 2011, page 13.
- If you want to understand opposition to climate action, follow the money.
- ‘Since global warming Eskimos now have twenty different words for water.’
- John O'Farrell - This Is Your Life 2001
- "Brent Cross under a slate-grey sky on a Monday afternoon is enough to challenge the most optimistic and rational liberal. It focuses the mind on the waste, greed, and short-sightedness of our species: you wonder how we are going to survive the enormous changes that the 21st century undoubtedly has in store, the largest of which any sane mind knows is global warming."
- Henry Porter, UK Guardian July 16, 2006 
- "I have not been one who believed in the global warming. But I tell you, they are making a convert out of me as these blistering summers. They have broken heat records in a number of cities already this year and broken all-time records and it is getting hotter and the ice caps are melting and there is a build up of carbon dioxide in the air. We really need to address the burning of fossil fuels."
- Pat Robertson, 700 Club, talking about the heat wave on August 3, 2006[specific citation needed]
- "We simply must do everything we can in our power to slow down global warming before it is too late... The science is clear. The global warming debate is over."
- 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[specific citation needed]
- At its core, global climate change is not about economic theory or political platforms, nor about partisan advantage or interest group pressures. It is about the future of God's creation and the one human family. It is about protecting both `the human environment' and the natural environment.
- United States Conference of Catholic Bishops statement 
- According to IPCC we should not use all the known fossil energy if we would like to prevent the most serious climate change cathastrophes. It does not make any sense to look for new oil from a fragile environment in the Arctic when we have to leave also the known resources on ground.
- HS 4.10.2013 opinion page, (In Finnish: ”Jos ihmiskunta meinaa välttää pahimmat ilmastonmuutoksen vaikutukset, se voi IPCC;n tuoreen arvion mukaan päästä ilmakehään enää hiilidioksidimäärän joka vastaa vain pientä osaa tunnetuista fossiilisten polttoaineiden varannosta. Ei ole juuri mieltä etsiä enää lisää öljyä luonnoltaan haavoittuvalta Pohjoiselta Jäämereltä, kun tunnetuistakin varannoista valtaosa on jätettävä maahan.” )
- "Each of the last three decades has been successively warmer at the Earth’s surface than any preceding decade since 1850."
- "Global warming — at least the modern nightmare vision - is a myth. I am sure of it and so are a growing number of scientists. But what is really worrying is that the world's politicians and policy makers are not."
- David Bellamy, Daily Mail, July 2004
- "The problem we are faced with is that the meteorological establishment and the global warming lobby research bodies which receive large funding are now apparently so corrupted by the largesse they receive that the scientists in them have sold their integrity. "
- Piers Corbyn, Weather Action bulletin, December 2000.
- Let's be clear: the work of science has nothing whatever to do with consensus. Consensus is the business of politics. Science, on the contrary, requires only one investigator who happens to be right, which means that he or she has results that are verifiable by reference to the real world. In science consensus is irrelevant. What is relevant is reproducible results. The greatest scientists in history are great precisely because they broke with the consensus.
There is no such thing as consensus science. If it's consensus, it isn't science. If it's science, it isn't consensus. Period.
- "All this concern with the effects of global warming is another manifestation of being politically correct"
- Lord Young of Graffham, in a letter to The Times, 28th Nov 2000.
- "Global warming is indeed a scam, perpetrated by scientists with vested interests, but in need of crash courses in geology, logic and the philosophy of science."
- Dr Martin Keeley, Visiting Professor in Petroleum Geology, University College London, 2004-12-06. [BBC]
- Sea levels have been rising steadily since the peak of the last Ice Age about 18,000 years ago. The total rise since then has been four hundred feet...For the last 5,000 years or so, the rate of rise has been about seven inches per century.
The Medieval and Roman warmings, with their intervening cold periods, present a huge problem for the advocates of man-made global warming. If the Medieval and Roman occurred warmer than today - without greenhouse gases, what would be so unusual about modern times being warm as well?
The temperatures at the North and South Poles are lower now than they were in 1930. The Antarctic Peninsula, the finger of land pointing north towards Argentina (and the equator) has been getting warmer...The other 97 percent of Antarctic has been cooling since the mid-1960s.
- "Global Warming" represents the last gasp of so-called "scientific progressivism", a mass of pitifully transparent falsehoods being employed to justify reducing mankind under the absolute despotism of "experts", the obvious implication being that we can’t even breathe responsibly. Environmentalism, Gaianism, is a religion on the basis of which — illegally under the First Amendment — public policy is being generated. Exhaling carbon dioxide is Original Sin, a reliable source of unlimited power and wealth to a Parasitic Class of politicians, bureaucrats, and cops with which our civilization now finds itself infested.
- I'm agnostic as to the causes. All I know is there is water where there once was ice.
- Admiral Thad Allen, US Coast Guard, quoted in Smithsonian Magazine, March 2010.
- Global warming causing climate change may be the ultimate issue that unites us all.
- Louise Burfitt-Dons, Humanitarian Campaigner, speech at Institute of Physics, London (June 2008)
- The world must come together to confront climate change. There is little scientific dispute that if we do nothing, we will face more drought, famine and mass displacement that will fuel more conflict for decades.
- U.S. President Barack Obama, Awake! magazine November 2011, page 12.