Global review June-August 2023

Analysis using the Climate Shift Index (CSI) shows that human-caused climate change significantly increased the likelihood of record-shattering heat during the June-August 2023 period. Approximately 48% of the global population experienced at least 30 days where heat was made at least three times more likely by climate change (CSI level 3 or higher). The report highlights a stark inequity in exposure, noting that countries with the lowest historical emissions experienced three to four times more days of very strong climate fingerprints than G20 countries.

• The Northern Hemisphere summer of 2023 was the hottest on record, with July 2023 specifically being the hottest month ever recorded globally.
• A significant portion of the global population was exposed to extreme heat driven by climate change: 48% (over 3.8 billion people) experienced at least 30 days with a Climate Shift Index (CSI) level 3 or higher, meaning the heat was at least three times more likely due to human-caused climate change.
• Daily exposure to strong climate-driven heat (CSI level 3+) affected between 1.5 billion and 4.2 billion people every day from June to August 2023, peaking on August 16, 2023.
• There is a disproportionate burden of climate-driven heat on low-emitting nations; countries with the lowest historical emissions experienced three to four times more days at CSI level 3 or higher than G20 countries.
• Persistent extreme heat (CSI level 3 or higher for at least half the period) was observed in 79 countries, including a high concentration of U.N.-designated least developed countries and small island developing states (62% of these countries), despite these groups accounting for only about 7% of cumulative historical greenhouse gas emissions.

APA

Pershing, A. (2023). Global review June-August 2023. Climate Central. https://www.climatecentral.org/climate-matters/global-review-June-August-2023

Chicago

Pershing, Andrew. Global review June-August 2023. Climate Central, 2023. https://www.climatecentral.org/climate-matters/global-review-June-August-2023.

Wikipedia

{{cite report |last1=Pershing |first1=Andrew |title=Global review June-August 2023 |publisher=Climate Central |date=7 September 2023 |url=https://www.climatecentral.org/climate-matters/global-review-June-August-2023 |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{pershing2023global, author = {Pershing, Andrew}, title = {{Global review June-August 2023}}, institution = {Climate Central}, year = {2023}, month = sep, url = {https://www.climatecentral.org/climate-matters/global-review-June-August-2023}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }