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Woman and family look out at floodwaters caused by Harvey in Houston, TX. Photo: Charlie Riedel / AP

Rainfall from Hurricane Harvey, which struck Houston over the summer, was at least 15% heavier due to human caused climate change, according to two independent studies by researchers at the Lawrence Berkeley National Laboratory and Royal Netherlands Meteorological Institute. Hurricanes like Harvey are also three times more likely today than in 1900, researchers reported.

Why it matters: This isn't the first time scientists have attributed violent weather events to a warming planet, The Washington Post reports. Scientists have also warned of the increased likelihood of droughts such as the one in Texas in 2010 and floods similar to Colorado's in 2013. These findings suggest cities and communities may need to reassess their risk and find new ways to prepare for harsher weather as climate change continues.

The studies:

  1. Researchers in the Netherlands found the storm's precipitation was 15% more intense due to climate change compared to a similar storm in the early 1900s. They also reported "a deluge such as Harvey would have occurred in the region once every 2,400 years in the pre-warming period but that it is now a 1-in-800 year event — and is becoming more likely," per The Post.
  2. The Lawrence Berkeley National Laboratory team found that rainfall was increased by at least 19% and as much as 38%, and that the chances of a storm with as much rainfall has at least tripled since the 1900s.
“We have two independent efforts with essentially the same answer. There’s a clear human fingerprint. The numbers will undoubtedly change as more researchers look at this with different techniques, and perhaps different data sets and different methods. But our numbers are kind of big.”— Michael Wehner, senior staff scientist at Berkeley

How it works: "Climate change, caused by increasing greenhouse gases in the atmosphere from the burning of fossil fuels, is raising temperatures globally. Warmer air can carry more moisture, which can lead to more extreme rainfall events, and warmer ocean surface temperatures are known to intensify the most powerful hurricanes," according to the press release from the American Geophysical Union fall meeting taking place this week.

Go deeper

4 mins ago - World

Former spy Steele defends controversial Trump Russia dossier

Former U.K. intelligence officer Christopher Steele arrives at the High Court in London in July 2020. Photo: Tolga Akmen/AFP via Getty Images

The author of the "Steele Dossier," containing unverified claims about former President Trump told ABC News he stands by his controversial report, according to excerpts from an upcoming documentary published Sunday.

Why it matters: Former British intelligence officer Christopher Steele's dossier was used as part of former special counsel Robert Mueller's investigation into the Trump campaign's alleged links to Russia's government.

Ina Fried, author of Login
4 hours ago - Technology

Intel CEO sees making own chips as a matter of national security

Pat Gelsinger. Photo: Axios on HBO

Intel CEO Pat Gelsinger is putting the pressure on the U.S. government to help subsidize chip manufacturing, insisting the current reliance on plants in Taiwan and Korea as "geopolitically unstable."

Why it matters: There is bipartisan support for funding the domestic semiconductor industry, but Congress has yet to sign the check. The Senate has passed the CHIPS Act that includes $52 billion in semiconductor investment, but it has yet to pass the House.

Updated 4 hours ago - World

17 U.S. and Canadian missionaries kidnapped in Haiti

Haitian soldiers guard the public prosecutor's office in Port-au-Prince this month. Photo: Richard Pierrin/AFP via Getty Images

Children are among a group of 17 missionaries kidnapped in Port-au-Prince, Haiti, per a statement from Christian Aid Ministries Sunday.

The latest: "The group of 16 U.S citizens and one Canadian citizen includes five men, seven women, and five children," the Ohio-based group said. Haitian police inspector Frantz Champagne on Sunday identified the 400 Mawozo gang as the group responsible, in a statement to AP.

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