Natural disasters linked to climate change
Scientists have long been able to definitively link climate change to general, long-term trends like the rising sea levels and rising temperatures. They've even been able to show how a changing climate influences and aggravates natural disasters like floods, fires, droughts, and hurricanes. Recently, however, a new sub-field has gained interest and credibility in the climate science community.
Called "attribution science," or "attribution research," the emerging discipline is building a consensus among scientists that experts can, and should, be more definitive and precise in linking specific natural events to climate change. That's something scientists have long hesitated to do, in part, because of the sensitive political nature of the subject, but also because of the complex nature of weather events and their many drivers. A recent report by Scientific American, however, calls attribution research "one of the most rapidly expanding areas of climate science." And a feature article in the journal Nature cited extensive research projects showing that scientists could definitively say a specific event would have been less likely to happen or been less severe if climate change weren't a factor.
The emergence of attribution science is well-timed. In July, a stifling heat wave held as many as 200 million Americans hostage as record temperatures scorched two-thirds of the country. At least six people died during the event, just one in a decades-long string of record-breaking natural disasters. The 21st century has not been kind to the planet's inhabitants, as floods, fires, hurricanes, tornadoes, droughts, and heat waves have caused havoc with historic frequency and severity, each seeming to break a record that had just been broken.
Here's a look at the disasters that have been linked to climate change by the most compelling attribution research available. No longer confined to vagaries like "hurricanes will become more intense" or "droughts will be more severe," climate scientists can now attribute specific events to changing climate patterns that enhance them, aggravate them, or make them more likely.
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2010 Russia heat wave
In 2010, Russia was in the grip of a record-breaking heat wave so extreme that it contributed to the deaths of as many as 50,000 people, according to Scientific American. One research paper concluded that natural weather patterns made the heat wave much more severe, and another determined that climate change made it much more likely. Although the reports seemed to conflict, it was a major early victory for attribution research—scientists could now pinpoint the difference between likelihood and severity in terms of global warming's impact on a specific weather event.
2018 California Camp Fire
The Camp Fire of 2018 was catastrophic even by the standards of California summer wildfires, an annual ordeal of destruction natural to the state's ecosystems. What is not natural, however, is that California's burn area has increased fivefold since 1972, a phenomenon that can "very likely" be attributed to climate change, according to the scientific journal Earth's Future. The Camp Fire killed 86 people and caused more than $16 billion in damage.
Because hurricanes are powered by deep, warm water—like the kind found in the Caribbean where Atlantic hurricanes form—climate scientists have long been able to predict correctly that global warming would make intense, destructive hurricanes more frequent. In 2017, the proof came in the form of 16 $1 billion-plus natural disasters in a single year—and Hurricane Harvey was the worst of them all. The Category 4 storm, which crippled Houston and killed dozens of people, likely achieved its massive size and drenching rains because climate change gave it extra fuel in the form of warmer Caribbean seas, according to Scientific American.
Also in 2017, a Category 5 monster hurricane named Maria devastated the Caribbean, particularly Domenica, the U.S. Virgin Islands, and Puerto Rico, killing over 3,000 people. In 2019, the American Geophysical Union released a report linking Maria—which dumped more rain on Puerto Rico than any storm since 1956—to climate change. The study's authors concluded that the event was "much more likely" to occur in the climate era of 2017 than it ever would have been when the first records were kept in the 1950s.
The year 2017 witnessed three of the five most costly hurricanes in U.S. history: Harvey, Maria, and Irma. Irma was the strongest hurricane ever recorded outside of the Gulf of Mexico or the Caribbean Sea—it remained a Category 5 storm for a record three full days—and Florida took the brunt of the impact when it made its way to the U.S. mainland. Because of global warming-induced rising sea levels, however, the storm surges it generated wreaked havoc as far north as Charleston, S.C., according to climate scientists interviewed by CNN.
The year before 2017 set a new precedent for devastating weather events—Hurricane Matthew crushed Florida, the Carolinas, and especially Haiti, where hundreds of people were killed. Usually, hurricanes "just happen," provided they have moist air, warm water, and converging winds, according to a report by the Union of Concerned Scientists. But this was different. A Category 5 storm, Matthew was born in waters where record temperatures were tallied, a phenomenon that has caused the number of Category 4 and 5 hurricanes to double since the 1970s.
January 2016 winter blizzard
The winter blizzard of 2016 left 55 people dead in a historic storm that dumped three feet of snow on the Mid-Atlantic and Northeastern United States for three straight days. While it's counterintuitive to associate global warming with blizzards, climate change intensifies extreme weather events of all kinds. According to Climate Central, an organization of climate scientists and journalists, warming temperatures created moister air, which led to enhanced precipitation in the form of extreme snowfall in the 2016 blizzard.
2016 West Virginia floods
West Virginia is one of the most flood-prone states in the country, but even by the standards of Central Appalachia, the flood of 2016 was historic. Climate Signals, a science information project of Climate Nexus, attributed it to "once-in-a-thousand-years rainfall." The organization notes that extreme precipitation in the region of the United States that contains West Virginia increased by 71% between 1958 and 2012. "Rare and extreme rainfall," Climate Signals reports, is the result of climate change because warmer air holds more water, which leads to more frequent and severe rain events.
2015 Texas and Oklahoma Floods
In 2015, a full week of heavy rain led to record-breaking flooding—not to mention historic tornado outbreaks—across Texas and Oklahoma. Nearly 60 people were killed in the wettest May on record in both states. In the catastrophe's wake, Geophysical Research Letters published a study that determined the floods were caused by a supercharged El Niño weather event, and that global warming has made modern El Niño patterns more severe than in previous decades.
2011 Tornado Superoutbreak
In April 2011, at least 360 tornadoes tore through the American South, Midwest, and Northeast, killing almost 350 people in the most significant, deadliest, and costliest tornado outbreak in U.S. history. The National Oceanic and Atmospheric Administration's (NOAA) Climate Attribution Rapid Response Team investigated the event. Although it could not directly attribute the outbreak to global warming, the team determined that climate change-induced atmospheric instability could be generating more of the kinds of thunderstorms that spawn tornadoes than would have existed before global warming.2018 All rights reserved.