evidence: As is normal, the cities, as plaintiffs, were first to give presentations. Myles R. Allen, an Oxford University professor of geosystem science with over 120 peer-reviewed articles involving different aspects of atmospheric science, outlined the early history and research regarding climate science. Allen has worked for the Intergovernmental Panel on Climate Change (IPCC) for over 20 years as a lead author on the 3rd, 4th, and 5th assessments. The IPCC is an intergovernmental body of the United Nations that is dedicated to providing the world with objective, scientific information relevant to understanding the scientific basis of the risk of human-induced climate change; its natural, political, and economic impacts and risks; and possible response options. The assessments are status reports that provide an update on the knowledge of the scientific, technical, and socioeconomic aspects of climate change. Thousands of scientists from countries all over the world do the work of the IPCC.