Robert Wahl, here is the proof of global warming (Reader Input, Oct. 26).

It is the Intergovernmental Panel on Climate Change (IPCC), which is a scientific intergovernmental body tasked to evaluate the risk of climate change caused by human activity.

This panel of the United Nations concludes that most of the observed temperature increase since the middle of the 20th century was caused by increasing concentrations of greenhouse gases resulting from human activity such as fossil fuel burning and deforestation.

The IPCC bases its assessment mainly on peer reviewed and published scientific literature. IPCC reports are widely cited in almost any debate related to climate change. National and international responses to climate change generally regard the UN climate panel as authoritative.

These basic conclusions have been endorsed by more than 40 scientific societies and academies of science, including all of the national academies of science of the major industrialized countries.

There is new and stronger evidence that most of the warming observed over the last 50 years is attributable to human activities.

Since 2007, no scientific body of national or international standing has maintained a dissenting opinion.

Joe Marman, Auburn