The study analysed temperatures and heat waves of 920 major cities in 175 countries and found an average warming of more than 1.3 degrees Celsius above the pre-industrial era

As many as 15 cities in India experienced a minimum five days of extreme heat in 2023, says a new study by Climate Central, an independent group of scientists, which warned that the past 12 months between November 2022 and October 2023 have been the “hottest ever recorded” in 1,25,000 years.

The study analysed temperatures and heat waves of 920 major cities in 175 countries and found an average warming of more than 1.3 degrees Celsius above the pre-industrial era. The African continent had 44 of the 52 countries in the red with Rwanda classified as the worst effected by the rising heat.

In Asia, 32 of the 47 countries were affected. Four of 38 countries in Europe, 14 of 17 in north and central America, six of eight in Oceania and eight of 13 in South America were hit by the rising heat. The study quantified the local influence of climate change on daily temperatures across the globe. Using a peer-reviewed scientific methodology, it graded the higher temperature as various levels of climate shift index (CSI), to estimate how much human-induced climate change shifted the odds of daily temperatures that people experience locally.If CSI 1 indicates a clear climate change signal, levels between 2 and 5 mean that climate change made those higher temperatures two to five times more likely.

It analysed 70 cities in India of which 12 cities, including Bengaluru, Visakhapatnam, Thane and Guwahati, had more than 100 days of higher than normal temperature classified as climate shift index level 5. A total of 21 cities across the country 100 days of slightly above average temperature, classified as CSI level 3. Other than the population in Punjab, Haryana and Rajasthan 100 per cent of the population across 30 states/union territories were exposed to climate shift index 3 and above for five days. Across the world, 90 per cent of the people (7.3 billion) experienced at least 10 days of temperatures very strongly affected by climate change and 73 per cent (5.8 billion) experienced more than a month’s worth of these temperatures. One in four people experienced a five-day heat wave that was strongly influenced by carbon pollution.