There is a significant scientific consensus about global warming; specifically that humans are causing the widespread warming on the Earth. It was found that at least 97% of expert climate scientists agree with this claim, thus forming a dominant scientific consensus within the community. In addition, most of the leading scientific organizations worldwide have openly expressed their support for this claim, such as the IPCC. Click here to see a list of these scientific organizations.
The importance of this consensus is often underestimated by the public. This is due in part to the spreading of misinformation by climate change deniers, as well as a misunderstanding of how climate scientists came to these conclusions. The trust that people place upon experts in other fields, such as doctors, is much higher than is placed upon climate experts mostly due to this misinformation; only 16% of Americans realize the consensus is over 90%.
There are many reasons that explain why the majority of the scientific community agrees on humanity's effect on climate change. Many of which are covered on this website:
When substantial evidence piles up in favor of a hypothesis, it becomes increasingly difficult to outright dismiss it. It also becomes much easier to take a stand in favor of the hypothesis. This is the case for human-induced global warming, as scientists can recognize as objectively as possible that global warming is in fact being caused by humans. It isn't just increasing temperatures that scientists can agree on, as the following table shows the likelihood of various phenomena occurring into the future.
|Phenomena and direction of trend||Likelihood of humans contributing||Likelihood of further changes into the late 21st century|
|Warmer and/or fewer cold days and nights over most land areas||Very likely||Virtually certain|
|Warmer and/or more frequent hot days and nights over most land areas||Very likely||Virtually certain|
|Heat waves; frequency and/or duration increases over most land areas||Likely||Very likely|
|Heavy precipitation events; increase in the frequency, intensity, and/or amount of heavy precipitation||Medium confidence||Very likely over most of the mid-latitude land masses and over wet tropical regions|
|Increase in intensity and/or duration of drought||Medium confidence||Likely on a regional to global scale|
|Increases in intense tropical cycle activity||Low confidence||More likely than not (in the Western North Pacific and North Atlantic)|
|Increased incidence and/or magnitude of extreme high sea level||Likely||Very likely|
The video below is an explanation by lead author of the consensus study, explaining methods of determining the consensus, as well as its importance.