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All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. 941-954. Cambridge University Press.
"There is overwhelming evidence that human-induced climate change is already real and will increase. Climate science shows what is needed to limit warming to about 2C, and restrict impacts on rainfall, extreme events, ecosystems and more: global greenhouse gas emissions have to be cut by around 60% by 2050 (80% for Australia) with continued decreases after that."