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An Inconvenient Truth is a 2006 American documentary film directed by Davis Guggenheim about former vice president of the United States Al Gore 's campaign to educate people about global warming. The film features a slide show that, by Gore's own estimate, he has presented over 1,000 times to audiences worldwide.
Hansen concluded that global warming would be evident within the next few decades, and that it would result in temperatures at least as high as during the Eemian. He argued that if the temperature rose 0.4 °C above the 1950–1980 mean for a few years, it would be the "smoking gun" pointing to human-caused global warming. [54]
The global average and combined land and ocean surface temperature show a warming of 1.09 °C (range: 0.95 to 1.20 °C) from 1850–1900 to 2011–2020, based on multiple independently produced datasets. [16] The trend is faster since the 1970s than in any other 50-year period over at least the last 2000 years. [16]
The scientific consensus regarding causes and mechanisms of climate change, its effects and what should be done about it (climate action) is that: It is "unequivocal" and "incontrovertible" that the greenhouse gas emissions from human activities have caused warming on land, in oceans and in the troposphere.
Scientific consensus on causation: Academic studies of scientific agreement on human-caused global warming among climate experts (2010–2015) reflect that the level of consensus correlates with expertise in climate science. [98] A 2019 study found scientific consensus to be at 100%, [99] and a 2021 study concluded that consensus exceeded 99% ...
Climatologists now say that the best case scenario — assuming immediate and dramatic emissions curbs — is that planetary surface temperatures will increase by at least 2 degrees Celsius in the coming decades. This may sound like a small uptick, but the implications are profound. Rising temperatures will destroy plant and animal habitats ...
Contents. Patrick Michaels. Patrick J. Michaels (February 15, 1950 – July 15, 2022) was an American agricultural climatologist. [ 1 ][ 2 ][ 3 ] Michaels was a senior fellow in environmental studies at the Cato Institute until 2019. Until 2007, he was research professor of environmental sciences at the University of Virginia, where he had ...
Effects of climate change are well documented and growing for Earth's natural environment and human societies. Changes to the climate system include an overall warming trend, changes to precipitation patterns, and more extreme weather. As the climate changes it impacts the natural environment with effects such as more intense forest fires ...