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The Anthropogenic Climate Change Thread


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western North America heatwave

"Never in the century-plus history of world weather observation have so many all-time heat records fallen by such a large margin than in the past week’s historic heat wave in western North America. The only heat wave that close is the great Dust Bowl heat wave of July 1936 in the U.S. Midwest and south-central Canada. But even that cannot compare to what happened in the Northwest U.S. and western Canada over the past week.

“This is the most anomalous regional extreme heat event to occur anywhere on Earth since temperature records began. Nothing can compare,” said weather historian Christopher Burt, author of the book “Extreme Weather.”

Pointing to Lytton, Canada, he added, “There has never been a national heat record in a country with an extensive period of record and a multitude of observation sites that was beaten by 7°F to 8°F.”"

yale climate connection.

 

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https://www.theguardian.com/environment/2021/jul/14/amazon-rainforest-now-emitting-more-co2-than-it-absorbs

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The Amazon rainforest is now emitting more carbon dioxide than it is able to absorb, scientists have confirmed for the first time.

The emissions amount to a billion tonnes of carbon dioxide a year, according to a study. The giant forest had previously been a carbon sink, absorbing the emissions driving the climate crisis, but is now causing its acceleration, researchers said.

Most of the emissions are caused by fires, many deliberately set to clear land for beef and soy production. But even without fires, hotter temperatures and droughts mean the south-eastern Amazon has become a source of CO2, rather than a sink.

The scientists said the discovery that part of the Amazon was emitting carbon even without fires was particularly worrying. They said it was most likely the result of each year’s deforestation and fires making adjacent forests more susceptible the next year. The trees produce much of the region’s rain, so fewer trees means more severe droughts and heatwaves and more tree deaths and fires.

The research, published in the journal Nature, involved taking 600 vertical profiles of CO2 and carbon monoxide, which is produced by the fires, at four sites in the Brazilian Amazon from 2010 to 2018. It found fires produced about 1.5bn tonnes of CO2 a year, with forest growth removing 0.5bn tonnes. The 1bn tonnes left in the atmosphere is equivalent to the annual emissions of Japan, the world’s fifth-biggest polluter.

 

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https://www.cbc.ca/news/business/greenland-oil-1.6105230

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The government of Greenland has decided to suspend all oil exploration off the world's largest island, calling it "a natural step" because the Arctic government "takes the climate crisis seriously."

No oil has been found yet around Greenland, but officials there had seen potentially vast reserves as a way to help Greenlanders realize their long-held dream of independence from Denmark by cutting the subsidy of the equivalent of about $680 million Canadian the Danish territory receives from the Danish government every year.

Global warming means that retreating ice could uncover potential oil and mineral resources which, if successfully tapped, could dramatically change the fortunes of the semi-autonomous territory of 57,000 people.

"The future does not lie in oil. The future belongs to renewable energy, and in that respect we have much more to gain," the Greenland government said in a statement. The government said it "wants to take co-responsibility for combating the global climate crisis."

 

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