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Between October 2021 and September 2022, more than 7.6 billion people, 96% of the world's population, endured average daily temperatures clearly influenced by climate change.
A Climate Central study indicates that 7.6 billion people in 2022 endured average daily temperatures clearly influenced by climate change. The study is based on observations made throughout the year in more than 1,000 cities around the planet
It is the conclusion of a study that applied the CSI, using peer-reviewed attribution methods developed through a collaboration led by Climate Central. The report details global patterns and rankings based on daily assessments over the past 12 months, and a new map-based tool visualizes the index scores for 1,021 cities around the world each day.
People living near the equator and on small islands were particularly affected: Mexico, Brazil, West and East Africa, the Arabian Peninsula and the Malay Archipelago experienced the greatest influence of human-caused climate change on temperatures over the 365 years.
Every day during the 12-month period, at least 200 million people experienced temperatures with a CSI level of 3 or higher, explains Climate Central in a statement.
The Index applies a five-point scale to indicate how much more likely or frequent daily temperatures have become as a result of climate change. For example, a Climate Change Index (CSI) of 3 means that the day's temperature became at least 3 times more likely than it would have been without the influence of human-caused climate change.
Over 75 days, more than 1 billion people experienced temperatures at a CSI level of 3 or higher, with a peak of 1.7 billion people on October 21, 2021.
'Unfair and tragic'
The cities with the largest populations exposed to the most days with CSI levels of 3 or more include Mexico City, Singapore, and Lagos, Nigeria.
"Being able to reliably detect the fingerprints of climate change in everyday weather, anywhere in the world, represents a vital advance in climate attribution science," said Dr. Andrew Pershing, director of climate science at Climate Central.
“The Climate Change Index brings established scientific methodologies into the public domain in a clear and accessible way. This tool can help people understand and talk about how changing weather is shaping local weather as it happens."
"Island temperatures are strongly determined by the temperature of the ocean around them," said Strauss, who has also mapped the projected impacts of sea level rise on coastal areas around the world.
"Seeing that small island states have essentially already lost their historic climates, even as they face losing their land to rising seas, feels very unfair and tragic."
The urgent need for money to help vulnerable tropical nations adapt to climate shocks will be squarely on the table when nearly 200 countries meet in 10 days for the United Nations climate talks in Egypt.
Rich nations have yet to make good on a decade-old promise to increase climate finance for developing nations to $100 billion per year, even though the UN climate advisory panel the IPCC estimates the costs Annual adaptation costs could reach $1 trillion by 2050 if global warming continues apace.
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