U.S. climate report warns of disasters

As California’s catastrophic wildfires recede and people rebuild after two hurricanes, a massive new federal report warns that these types of disasters are worsening in the United States because of global warming. The White House report quietly issued Friday also frequently contradicts U.S. President Donald Trump.

The National Climate Assessment was written long before the deadly fires in California this month and before Hurricanes Florence and Michael raked the East Coast and Florida. It says warming-charged extremes “have already become more frequent, intense, widespread or of long duration.” The report notes the last few years have smashed U.S. records for damaging weather, costing nearly $400 billion since 2015.

The recent Northern California wildfires can be attributed to climate change, but there was less of a connection to those in Southern California, said coauthor William Hohenstein of the U.S. Department of Agriculture.

“A warm, dry climate has increased the areas burned over the last 20 years,” he said at a press conference Friday.

The report is mandated by law every few years and is based on more than 1,000 previous research studies. It details how global warming from the burning of coal, oil and gas is hurting each region of the United States and how it impacts different sectors of the economy, including energy and agriculture.

“Climate change is transforming where and how we live and presents growing challenges to human health and quality of life, the economy, and the natural systems that support us,” the report says.

That includes worsening air pollution causing heart and lung problems, more diseases from insects, the potential for a jump in deaths during heat waves, and nastier allergies.

“Annual losses in some economic sectors are projected to reach hundreds of billions of dollars by the end of the century — more than the current gross domestic product (GDP) of many U.S. states,” the report says. It’ll be especially costly on the nation’s coasts because of rising seas and severe storm surges, which will lower property values. And in some areas, such as parts of Alaska and Louisiana, coastal flooding will likely force people to relocate.

“We are seeing the things we said would be happening, happen now in real life,” said another coauthor Katharine Hayhoe of Texas Tech University. “As a climate scientist it is almost surreal.”

And Donald Wuebbles, a coauthor and University of Illinois climate scientist, said, “We’re going to continue to see severe weather events get stronger and more intense.”

What makes the report different from others is that it focuses on the United States, then goes more local and granular.

“All climate change is local,” said Pennsylvania State University climate scientist Richard Alley, who wasn’t part of the report but praised it.

While scientists talk of average global temperatures, people feel extremes more, he said.

“We live in our drought, our floods and our heat waves. That means we have to focus on us,” he said.

The Lower 48 states have warmed 1 C since 1900 with 0.66 C in the last few decades, according to the report. By the end of the century, the United States will be 1.6 to 6.6 C hotter depending on how much greenhouse gases are released into the atmosphere, the report warns.