Climate science has a long history. The Swede Svante Arrhenius in 1896 recognized that the burning of fossil fuels could add CO2 to the atmosphere in sufficient quantities to warm the Earth, though he thought it would take millennia for that to become apparent. Arrhenius himself thought this would be beneficial to agriculture, anticipating some contemporary emphatic climate change deniers for whom CO2 is nothing more or less than “plant food.” The twentieth century saw anthropogenic (i.e. caused by humans) climate change gradually progress from a scientific curiosity likely to arise only in a very distant future to something more pressing (see Weart, 2008 for a history). Charles Keeling began monitoring atmospheric CO2 on Mount Mauna Loa in the middle of the Pacific Ocean in 1958, providing strong evidence that CO2 levels were rising. In 1965 the Science Advisory Committee to the US president raised the specter of changes in the climate appearing by 2000. Climate science gradually grew in extent and prominence, aided by advances in satellite monitoring and computing power. One watershed moment occurred in 1988, on a hot day in Washington DC, when James Hansen of NASA testified to the Energy and Natural Resources Committee of the US Senate that global warming had arrived. The same year British Prime Minister Margaret Thatcher (who had a degree in chemistry) announced in a speech to the scientists of the Royal Society that she was convinced of the need to act—embracing environmental concern she had until then derided. Since the 1980s climate research has exploded, exploring ever more facets of the issue. The role of the IPCC, established by the United Nations in 1988, has become crucial. The Panel does not actually conduct or sponsor research itself, but rather summarizes the weight of scientific opinion in periodic assessment reports aimed at policy makers, especially those participating in the negotiations of the UNFCCC. With literally thousands of scientists from diverse disciplines participating in the assessment, it has a significant impact on how scientists connect their subsequent research to discoveries by others and learn how to communicate with each other, building an ever greater capacity to both assess and synthesize climate science into a more cohesive whole (Edwards, 2010).