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National Climate Assessment Predicts Growing Threats to Society, Economy

/in , , /by /E&E Newsby Chelsey Harvey

A long-awaited federal climate report, released Tuesday, delivers a blunt warning: Rapidly curb planet-warming emissions or face dire consequences to human health, infrastructure and the economy.

The fifth installment of the National Climate Assessment presents the most comprehensive evaluation to date of U.S. climate science, impacts and action. Dozens of authors, including representatives from multiple federal agencies, contributed to the congressionally mandated report.

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California Snowlines On Track To Be 1,600 Feet Higher by Century’s End

/in , , /by /Water News Networkby Robert Monroe Mentioned: San Diego County Water Authority

This winter produced record snowfall in California, but a new study suggests the state should expect gradually declining snowpacks, even if punctuated with occasional epic snowfalls, in the future.

An analysis by Tamara Shulgina, Alexander Gershunov, and other climate scientists at UC San Diego’s Scripps Institution of Oceanography suggest that in the face of unabated global warming, the snowlines marking where rainfall turns to snow have been rising significantly over the past 70 years. Projections by the researchers suggest the trend will continue with snowlines rising hundreds of meters higher by the second half of this century.

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‘Clairvoyant’ 2012 Climate Report Warned of Extreme Weather

/in , /by /Associated Pressby Seth Borenstein

Record high temperatures in urban Europe as heat waves bake the planet more often. Devastating floods, some in poorer unprepared areas. Increasing destruction from hurricanes. Drought and famine in poorer parts of Africa as dry spells worsen across the globe. Wild weather worldwide getting stronger and more frequent, resulting “in unprecedented extremes.”

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Forecasting Water Supply in Colorado River May Benefit Water Resource Management

/in , , /by /Utah Public Radioby Harriet Cornachione

What if I purchase an early season ski pass– will it pay off with good snow this winter? Yoshimitsu Chikamoto, a climate scientist at Utah State University Utah had an idea to use climate modeling to help him decide.

Weather forecasting targets a short term, days to weeks, mostly based on atmospheric conditions. Forecasting climate patterns a year in advance is more complex, said Chikamoto.

“Weather forecasting needs the atmospheric model. In the climate model the atmospheric model is one component of the climate that also needs ocean and sea ice, and the land,” Chikamoto said.

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Droughts That Start Over the Ocean? They’re Often Worse Than Those That Form Over Land

/in , , /by /Inside Climate Newsby Bob Berwyn

Droughts usually evoke visions of cracked earth, withered crops, dried-up rivers and dust storms. But droughts can also form over oceans, and when they then move ashore they are often more intense and longer-lasting than purely land-born dry spells.

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Opinion: Wildfires and Soaring Temperatures — the Hellscape Scientists Warned Us About is Here

/in , , /by /Los Angeles Timesby The Times Editorial Board

After an extended weekend of wildfires, part of an early fire season that has already seen a record 2 million acres burned and Death Valley-like temperatures smothering the San Fernando Valley, Californians would be right to wonder whether we are living in a hellscape. We are not, it’s safe to say. But we are living in the future that climate scientists have been trying to warn us about for years now.

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Groundbreaking Study: Earth Will Warm 4.9 to 7 Degrees F

/in , , /by /E&E Newsby Chelsea Harvey

How much warming will greenhouse gas emissions cause in the coming years? It’s one of the most fundamental questions about climate change — and also one of the trickiest to answer.

Now, a major study claims to have narrowed down the range of possible estimates.

It presents both good and bad news. The worst-case climate scenarios may be somewhat less likely than previous studies suggested. But the best-case climate scenarios — those assuming the least amount of warming — are almost certainly not going to happen.

It’s “the most important climate science paper that’s come out in several years,” according to climate scientist Andrew Dessler of Texas A&M University, who was not involved with the study.

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Study: Warming Makes US West Megadrought Worst in Modern Age

/in , , /by /AP Newsby Seth Borenstein

A two-decade-long dry spell that has parched much of the western United States is turning into one of the deepest megadroughts in the region in more than 1,200 years, a new study found.

And about half of this historic drought can be blamed on man-made global warming, according to a study in Thursday’s journal Science.

Scientists looked at a nine-state area from Oregon and Wyoming down through California and New Mexico, plus a sliver of southwestern Montana and parts of northern Mexico. They used thousands of tree rings to compare a drought that started in 2000 and is still going — despite a wet 2019 — to four past megadroughts since the year 800.

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