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Climate Change Intensifies Heat Wave in Mexico and Southwest US

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Human-induced Climate change significantly intensified the recent extreme heat wave affecting the Southwestern United States, Mexico, and Central America, according to a rapid assessment by World Weather Attribution. The study found that the likelihood of such scorching temperatures has increased dramatically due to the continuous burning of fossil fuels.

Source: NBC News/YouTube

The daytime temperatures have risen by 2.5 degrees Fahrenheit (1.4 degrees Celsius), making heat-related illnesses like heat stroke 35 times more likely. In parts of the United States, these conditions have been particularly harsh, with the Sonoran Desert recording a staggering 125 degrees Fahrenheit (51.9 degrees Celsius) – the hottest day in Mexican history.

Nighttime offers little relief, with temperatures remaining unusually high. This sustained heat through the night, about 2.9 degrees Fahrenheit (1.6 degrees Celsius) warmer than usual, has proven deadly. The absence of cooler nighttime temperatures, crucial for recovery from daily heat exposure, has resulted in at least 125 deaths so far.

Experts link these unprecedented temperature patterns directly to Climate change. “The level of intensity that we are seeing, these risks,” noted Karina Izquierdo, an urban advisor for the Red Cross and Red Crescent Climate Centre in Mexico City. The prolonged heat wave still affecting North America is no longer considered extraordinary but is increasingly viewed as a new norm.

Historical data underscores the dramatic shift in climate patterns. Compared to the year 2000, such extreme heat events are now four times more likely to occur and temperatures are nearly a degree Fahrenheit (0.5 degrees Celsius) higher. “What was once extreme but rare is becoming increasingly common,” stated Carly Kenkel, Chair of Marine Studies at the University of Southern California, who was not involved in the study.

This heat wave spanned a vast region including southern California, Arizona, New Mexico, Texas, Oklahoma, and several Central American countries, peaking in early June. Record-breaking temperatures were observed across multiple locations, with San Angelo, Texas, reaching a high of 111 degrees Fahrenheit (43.8 degrees Celsius) on June 4.

The study utilized both current and historical temperature data, comparing these to model simulations of a world without human-caused climate change. This method allowed researchers to isolate and identify the specific contributions of Global warming to the severity of this heat wave.

As this heat continues to impact vast regions, it exacerbates existing social and economic inequalities, highlighting the urgent need for comprehensive climate action and adaptation strategies to mitigate further harm and protect vulnerable communities.