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Which temperature limit did the Paris Agreement seek to keep global warming below?

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The Paris Agreement aims to hold the increase in global temperatures to "well below 2 °C (3.6 °F) above preindustrial levels" and to pursue efforts to limit the temperature increase to 1.5 °C (2.7 °F).1

While the initial objective of the United Nations conference was to prevent global temperatures from rising more than 2 °C above the benchmark set before the Industrial Revolution, the final agreement incorporated the more ambitious 1.5 °C target advocated by many nations, particularly those threatened by rising sea levels.21