Scientists Link Deadliest Weather Events to Climate Change Intensification

A recent analysis indicates that human-induced climate change rendered the ten most lethal extreme weather events of the past 20 years both more severe and more probable. These devastating storms, heatwaves, and floods impacted regions across Europe, Africa, and Asia, resulting in over 570,000 fatalities. The new findings underscore scientists’ current capability to identify the distinct influence of climate change within intricate weather phenomena. Conducted by scientists from the World Weather Attribution (WWA) group at Imperial College London, the study entailed re-evaluating data pertaining to several of these extreme weather occurrences. Dr Friederike Otto, co-founder and lead of WWA, stated, “This study should be an eye-opener for political leaders hanging on to fossil fuels that heat the planet and destroy lives.” She further added, “If we keep burning oil, gas and coal, the suffering will continue.” The researchers concentrated on the 10 most fatal weather events recorded in the International Disaster Database since 2004. This timeframe marks the publication of the initial study connecting a specific weather event—a heatwave in Europe—to our evolving climate. The most deadly event over the past two decades was a drought in Somalia in 2011, estimated to have caused the deaths of over 250,000 individuals. Investigators determined that the insufficient rainfall contributing to this drought was rendered both more probable and more severe by climate change. Among the events listed is the 2015 heatwave in France, which claimed over 3,000 lives, with researchers indicating that climate change doubled the likelihood of such high temperatures. The list also encompasses the European heatwaves of 2022, responsible for 53,000 deaths, and 2023, which resulted in 37,000 fatalities. According to the study, the 2023 event would not have occurred without climate change. The analysis states that the lethal tropical cyclones impacting Bangladesh in 2007, Myanmar in 2008, and the Philippines in 2013 were all rendered more probable and intense due to climate change. This finding also applies to the floods that struck India in 2013. Researchers suggest that the actual number of deaths from these incidents is probably considerably greater than the reported figures. This discrepancy arises because heatwave-related fatalities are often not officially documented as such in many parts of the world, particularly in more susceptible, less affluent countries. The completion of this study predates the storms in Spain this week, which caused dozens of deaths. The ability to establish a connection between climate change and weather events exists solely because Dr Otto and Dutch climatologist Geert Jan van Oldenborgh, co-founders of the WWA, developed a groundbreaking method to monitor global warming within severe weather occurrences. They were aware that meteorological records indicated an increase in the intensity of extreme weather events. Furthermore, extensive peer-reviewed scientific literature elucidated how atmospheric warming can exacerbate extreme weather. The missing component was a direct link between an individual event and escalating global temperatures. For many years, meteorologists have utilized atmospheric models for forecasting future weather patterns. Otto and Oldenborgh adapted these models to conduct multiple simulations, aiming to ascertain the probability of a specific weather event occurring under present climatic conditions. Additionally, they developed parallel simulations to investigate the likelihood of the identical event in a hypothetical world where the industrial revolution had not taken place. These computer models excluded the impacts of the billions of tonnes of CO2 emitted into the atmosphere by human activity. These calculations enabled a comparison of the event’s probability both with and without the 1.2C of global warming the planet has undergone since the industrial revolution. Roop Singh, from the Red Cross Red Crescent Climate Centre, which provides support to the WWA, commented, “The massive death tolls we keep seeing in extreme weather shows we are not well prepared for 1.3°C of warming, let alone 1.5°C or 2°C”. She further stated that the current study demonstrates the imperative for all nations to enhance their resilience to climate change, issuing a warning: “With every fraction of a degree of warming, we will see more record-breaking events that push countries to the brink, no matter how prepared they are.” A newsletter, named Future Earth, offers exclusive insights into the most recent climate and environment news from the BBC’s Climate Editor Justin Rowlatt, delivered weekly. An international version is available for those outside the UK. This content is Copyright 2024 BBC. All rights reserved. The BBC disclaims responsibility for the content of external websites. Information regarding their external linking policy is available.