L’actualité scientifique à petites doses

Quelques milligrams de toute l’actualité scientifique de la semaine

Publié le 3 juillet:

Eric-Pierre Champagne

Eric-Pierre Champagne
La Presse

Le gaz russe, le plus polluant

The most polluting gas and oil exploitation sites on the planet are located in Russia, Turkmenistan and Texas. C’est du moins le constat fait par une ONG américaine, le Rocky Montain Institute, qui vient de publier un report sur les sites d’exploitation d’énergies fossiles les most dommageables pour le climat. It is in Russia that we find the production that emits the most greenhouse gas, more precisely at the site of Astrakhanskoye, in the southeast of Moscow, near the Caspian Sea, where it is extracted from natural gas On y release the equivalent of 1 kg of CO2: per barrel product. Des sites pétroliers au Turkmenistan (un peu moins de 1 kg) et au Texas (908 g) arrive en 2e: and 3:e: position.

Quiz:

Les changements climatiques sont-ils toujours responsible des vagues de chaleur?


PHOTO PASCAL ROSSIGNOL, REUTERS

Champ de blé victime de la sécheresse à Blécourt, en France

According to the researchers of the Imperial College of Londres, il n’y a maintenant plus de doute. les vagues de chaleur sont toutes affectés par les changements climatiques. This is the main conclusion of a study published in the review Environmental Research: Climate:. En entrevue avec le journal scientifique New Scientist, l’auteur principal de l’étude, Friederike Otto, affirmed that “il ne fait aucun doute que le changement climatique changes vraiment la donne en ce qui concerne les vagues de chaleur”. Les scientifiques rappellent cpendant que des studies sont toujours necessaires pour évaluater avec exactitude l’impact des changements climatiques sur une wave de chaleur en particulier.

Le cipher

3 billion


PHOTO STEFANI REYNOLDS, AGENCE FRANCE-PRESSE

Tomatoes dans une épicerie de Washington

According to a study published in the review: Nature Food:, the carbon footprint of food transport at the scale of the planet is on the order of 3 billion tonnes of greenhouse gas (GHG), a balance at least 3.5 times higher than estimates previous ones It should be noted that the richest countries, which represent 12.5% ​​of the global population, are responsible for half (52%) of these emissions.

Des réservoirs d’eau à un niveau inquiétant


PHOTO RICH PEDRONCELLI, ASSOCIATED PRESS

Lake Oroville, the second most important reservoir in California, was at 55% of its capacity a month ago.

The two main reservoirs of water in California are currently at extremely low levels, which worries the authorities of the most populous state of the United States. The most important reservoir, that of Lake Shasta, was filled to only 40% of its capacity a month ago, while Lake Oroville, the second most important reservoir, was at 55% of its capacity. The experts fear the worst while the hottest months of the summer are coming. Already, millions of Californians are subject to severe restrictions on the use of potable water. The security that has been around for a few years in the American West is the most important thing ever seen in 1200 years, a study concluded last February.

Finances and biodiversity


PHOTO CLODAGH KILCOYNE, ARCHIVES REUTERS

Des membres d’Extinction Rebellion manifest during a conference on biodiversity in Dublin, in Ireland, le 8 juin dernier.

The loss of biodiversity could have a negative impact on the public finances of several countries, according to researchers from the University of Cambridge in the United Kingdom. According to their study, a “partial collapse of ecosystems” of fishing, tropical forest production and wild pollination would increase annual borrowing costs for 26 countries, including the United States, by 53 billion dollars. China, for example, could see its credit rate decrease by six cents, which would add 18 billion dollars to its interest payments every year. The team of researchers used data from the World Bank to assess the financial consequences of a partial ecosystem loss for each nation. Des costs qui viendront s’agouteur à ceux, déjà astronomiques, nécessaires pour faire face à la crisis climatique.

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