Tag Archives: Climate Change

Polar Bears Live on the Edge of the Climate Change Crisis | Science | Smithsonian Magazine

Photographs by Neil Ever Osborne; Text by Neil Ever Osborne and Mark Jacquemain

SMITHSONIAN MAGAZINE | March 2021

A polar bear, dependent on sea ice for its hunting grounds, pauses near Churchill, Manitoba. (Neil Ever Osborne)
A polar bear, dependent on sea ice for its hunting grounds, pauses near Churchill, Manitoba. (Neil Ever Osborne)

On the bay this fall morning, there’s a wind-carved rim of ice and a gathering of floes. One male polar bear, bony after a season without seal blubber, struggles along the slushy edge, haunches soaked, nearly slipping into the sea.

We are on Gordon Point, in northern Manitoba, where Hudson Bay widens into its northwest crescent. Polar winds make it colder than at comparable latitudes, and the shallow waters of the bay freeze early. Having passed the summer months in the subarctic wild of Wapusk National Park to the south, polar bears now congregate here, waiting for the ice to come in.

Source: Polar Bears Live on the Edge of the Climate Change Crisis | Science | Smithsonian Magazine

Upheaval and extinctions linked to magnetic reversal 42,000 years ago | Earth | EarthSky

Posted by Kelly Whitt in Earth | Human World | February 20, 2021

As the magnetic reversal of 42,000 years ago helped bring about earthly extinctions, these scientists said, the skies would have been lit by widespread auroras. These scientists suggest the reversal could help explain evolutionary mysteries, such as the extinction of Neanderthals. Image via Unsplash/ UNSW.

A magnetic reversal 42,000 years ago helped bring about earthly extinctions, scientists said, accompanied by changes in the sky including electrical storms and widespread auroras.

A new international study suggests that a magnetic field reversal – combined with changing solar winds – contributed to an environmental crisis and mass extinctions 42,000 years ago. It happened around the time of the demise of the Neanderthals, an extinct human species that once roamed what’s now Europe, these scientists said, and it would have come with electrical storms, widespread auroras and an influx of cosmic radiation.

Source: Upheaval and extinctions linked to magnetic reversal 42,000 years ago | Earth | EarthSky

Crisis Ensued The Last Time Earth’s Magnetic Poles Flipped, Researchers Say : NPR

  A giant kauri tree grows in Waipoua Forest in Northland, New Zealand. Trees like this one that fell long ago and were preserved for thousands of years are helping researchers discern fluctuations in the Earth's magnetic poles. Kim Westerskov/Getty Images
A giant kauri tree grows in Waipoua Forest in Northland, New Zealand. Trees like this one that fell long ago and were preserved for thousands of years are helping researchers discern fluctuations in the Earth’s magnetic poles. Kim Westerskov/Getty Images

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An ancient, well-preserved tree that was alive the last time the Earth’s magnetic poles flipped has helped scientists pin down more precise timing of that event, which occurred about 42,000 years ago.

This new information has led them to link the flipping of the poles to key moments in the prehistoric record, like the sudden appearance of cave art and the mysterious extinction of large mammals and the Neanderthals. They argue that the weakening of the Earth’s magnetic field would have briefly transformed the world by altering its climate and allowing far more ultraviolet light to pour in.

Source: Crisis Ensued The Last Time Earth’s Magnetic Poles Flipped, Researchers Say : NPR

Opinion: Bill Gates explains why he’s optimistic about preventing catastrophic climate change, even as he warns we have ‘no time to waste’

Bill Gates (left) and Connie Hedegaard
Project Syndicate

 Project Syndicate — This month Bill Gates published his new book, “How to Avoid a Climate Disaster: The Solutions We Have and the Breakthroughs We Need.” 

Connie Hedegaard: Let me start with a confession: For years, I thought you were not particularly interested in climate change. I vividly recall a closed session at Davos some years back. The discussion turned to climate, instead of other sustainability issues, and you left the room.

“We don’t have any time to waste.”

— Bill Gates


Source: Opinion: Bill Gates explains why he’s optimistic about preventing catastrophic climate change, even as he warns we have ‘no time to waste’

Librarians, ‘hactivists’ gather to secure federal data – Houston Chronicle

Photo: Annie Mulligan, Freelance
Photo: Annie Mulligan, Freelance

“On Saturday, about 100 librarians, academics, coders and socially minded “hactivists” showed up at Rice’s Fondren Library in an effort to protect the federal data that Yeung and other scientists rely on to do their jobs.”

Source: Librarians, ‘hactivists’ gather to secure federal data – Houston Chronicle

Alternative National Park Twitter Accounts Appear As EPA Media Blackout Continues : All Tech Considered : NPR

Countering the Trump administration’s restrictions on public communications, unofficial Twitter accounts for the National Park Service have been tweeting facts about climate change.

Source: Alternative National Park Twitter Accounts Appear As EPA Media Blackout Continues : All Tech Considered : NPR

Planet, California on pace for warmest year on record – SFGate

“The Earth is on track for its warmest year on record, federal scientists said Thursday after temperatures in October climbed to historical highs.

Despite relatively cool weather across much of the United States this year, including big snowstorms along the East Coast in recent days, four of the past five months worldwide have seen record-breaking average temperatures, according to the National Oceanic and Atmospheric Administration.

Record heat has flogged large chunks of Europe, Russia and the Pacific Ocean, scientists said.”

National Oceanic and Atmospheric Administratio...
National Oceanic and Atmospheric Administration of the U.S. logo (Photo credit: Wikipedia)

via Planet, California on pace for warmest year on record – SFGate.