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May 2017

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Trump still hasn’t decided whether to dump the Paris climate agreement or not. Born and raised in Oahu, Hawaii, Evan Weber went to the same K-through-12 school attended by future President Barack Obama. By the time Weber got to college, he was taking his fellow Punahou School alum to task for what Weber believed was an inadequate climate action plan. Together, Weber, a college buddy, and one of their professors drafted their own climate agenda, a policy report they initially simply called “The Plan.” A direct response to Obama’s 2013 climate plan, this version called for the U.S. to go even further in reducing carbon emissions and proposed a set of financial and regulatory solutions to make it happen. Weber ran an Indiegogo campaign to drum up support around The Plan and started popping up as a climate evangelist in media outlets like the Huffington Post, Al Jazeera, and Newsweek.

Now his goal is to build the political power necessary to enact it. Weber’s organization, U.S. Meet all the fixers on this year’s Grist 50. WaterCycle. Antarctica Is Going Green, Thanks To Climate Change. Climate change deniers have pointed to Antarctica’s apparently slow rate of change as a reason to doubt the scientific consensus on global warming. But new research investigating moss cover in the region suggests that this is just wishful thinking. Researchers from the University of Exeter say that over the past fifty years, scientists have documented far faster warming in both the Arctic and Antarctic than in other regions of the globe. Indeed, the Antarctic Peninsula has experienced an air temperature change of close to 3°C. And ocean temperatures west of the Antarctic Peninsula have warmed by roughly 1°C since 1995. As a whole, Antarctica has displayed one of the fastest warming rates of anywhere on the planet.

But changes in the region’s ice cover haven’t been as pronounced. Nevertheless, researchers have pointed to clues that Antarctica is changing rapidly. To illustrate and assess this change, researchers in this study aimed to get a snapshot of moss growth over the past 150 years. The sea is rising three times faster than we thought. If cities are the future of sustainability, they can’t only be green — they have to be livable, too.

Enter Ritchie Torres, New York City’s youngest elected official, hell-bent on making the city more affordable for its most vulnerable inhabitants. Torres, who is Afro-Latino and the first openly LGBT politician from the Bronx, cut his political teeth as a tenant organizer. He ran for city council in 2013 at the behest of a mentor who saw potential in the self-described introvert — and won. The young councilman’s driving issue is affordable housing, because, he says, “there can be no city without housing.” Torres grew up in Throggs Neck public housing directly across the street from Donald Trump’s golf course — as Torres puts it, with Trump’s shadow hanging “both literally and metaphorically over public housing.” Meet all the fixers on this year’s Grist 50.

Reassessment of 20th century global mean sea level rise. Author Affiliations Edited by Anny Cazenave, Centre National d'Etudes Spatiales, Toulouse Cedex 9, France, and approved April 17, 2017 (received for review September 28, 2016) Significance Estimates of global mean sea level (GMSL) before the advent of satellite altimetry vary widely, mainly because of the uneven coverage and limited temporal sampling of tide gauge records, which track local sea level rather than the global mean. Here we introduce an approach that combines recent advances in solid Earth and geoid corrections for individual tide gauges with improved knowledge about their geographical representation of ocean internal variability.

Abstract The rate at which global mean sea level (GMSL) rose during the 20th century is uncertain, with little consensus between various reconstructions that indicate rates of rise ranging from 1.3 to 2 mm⋅y−1. Footnotes. Les arbres marchent vers l’ouest. En fait, ailleurs dans le monde, botanistes et biologistes ont bel et bien noté des mouvements vers le nord. D’où la surprise devant cette nouvelle étude, publiée le 17 mai dans Science Advances : sur 86 espèces d’arbres poussant dans l’est de l’Amérique du Nord, et en s’appuyant sur les données du Service américain des forêts récoltées entre 1980 et 1995, puis entre 2013 et 2015, près de la moitié de ces arbres (47 %) ont progressé vers l’ouest de 15,4 kilomètres par décennie, et un tiers, de 11 km par décennie.

Reste une minorité qui a progressé vers le nord. Aucun n’a progressé vers le sud ou l’est. La plupart de ces « migrants » sont des arbres dits « à fleurs », soit essentiellement, pour cette région, des conifères . Qu’est-ce qui peut expliquer ce mouvement ? Des cristaux de glace en suspension produisent des flashes visibles depuis l'espace - Ciel & Espace. L'origine de mystérieux flashes lumineux présents sur certaines images satellites vient d'être découverte. Selon une équipe américaine, il s'agit de particules de glace en suspension dans les plus hautes altitudes de la troposphère.

Visibles notamment sur les images acquises par le satellite de météo spatiale DSCOVR, lancé conjointement par la Nasa, la National Oceanic and Atmospheric Administration (NOAA) et l'U.S. Air Force début 2015, ces étranges points lumineux demeuraient jusqu'à présent un mystère pour les scientifiques. Quelle pouvait être leur origine ? « Nous supposions qu'il s'agissait d'un effet de scintillation, dû à des paillettes de glace en suspension dans des cirrus, mais nous n'en avions pas la preuve » expliquent Alexander Marshak (Nasa) et ses collègues dans leur étude, parue dans la revue Geophysical Research Letters. La foudre hors de cause La Terre vue à deux millions de kilomètres par la sonde Galileo, le 11 décembre 1990.

Des microalgues pour sauver la planète. Meet the fixers: These activists want carbon polluters to pay. The National Offshore Petroleum Safety and Environmental Management Authority mentioned the leak in an annual report on offshore exploration but revealed no details about who operated the well. That information came to light on Friday, when Woodside Petroleum — Australia’s largest oil and gas producer, owned by Royal Dutch Shell — admitted to owning the well on the North West Shelf of the country.

The leak began in April 2016 and lasted about two months. All told, it spilled nearly 2,800 gallons of oil into the ocean. Woodside gave a statement to the Australian Broadcasting Company claiming the spill caused no damage: “Due to the composition of the fluid, small quantity released, water depth at release site, and distance from environmentally sensitive areas, there was no lasting impact to the environment.” “Companies that know they will be named in the case of an incident like this,” Hopkins said, “are going to be less likely to do it.”

Dramatic Venice sculpture comes with a big climate change warning. Italy's famed city of Venice has grappled with flooding and encroaching waters since the Middle Ages. But as global warming speeds up sea level rise, the charming destination is steadily slipping underwater. Italian artist Lorenzo Quinn calls attention to this threat with his arresting, larger-than-life sculpture in the sinking city. Support features two 5,000-pound hands bursting out of the Grand Canal and grasping the walls of the historic Ca' Sagredo Hotel. "I have three children, and I'm thinking about their generation and what world we're going to pass on to them," Quinn said in an interview. "I'm worried, I'm very worried. " Yet the sculpture, which was unveiled on May 13, is also a call for action — a plea to scientists, policymakers, and citizens alike to address human-caused climate change and its many impacts on communities and the environment.

"Something has to be done," the 51-year-old artist said. Quinn said he modeled the two hands after those of his 11-year-old son.

Agriculture et changement climatique - Copie

Supercomputer-models-show-severe-turbulence-will-increase-with-climate-change. By now most of us know about the major impacts that global climate change will cause like droughts and rising sea levels, but every once in a while we find out about strange consequences we hadn’t considered before like crops having lower nutritional value or planes encountering more turbulence. That’s right. Get ready for far bumpier flights in the future. Love This? Never Miss Another Story. Thanks for subscribing! A new study by a team at the University of Reading found that as carbon dioxide levels in the atmosphere increase throughout this century, severe turbulence — the kind that actually throws unbuckled passengers out of their seats — will become two to three times more common. Using a supercomputer, Dr. The cause of these increases is that climate change is generating stronger wind shears in the jet stream, which become unstable and cause turbulence.

This post originally appeared on TreeHugger. As New Jersey’s flooding crisis intensifies, low-income people feel the worst impacts. Coastal communities are enduring growing flood risks from rising seas, with places like Atlantic City, sandwiched between a bay and the ocean, facing some of the greatest threats. Guided by new research by Climate Central’s Scott Kulp and Benjamin Strauss, reporter John Upton and photographer Ted Blanco chronicled the plight of this city’s residents as they struggle to deal with the impacts. Upton spent months investigating how the city is adapting, revealing vast inequity between the rich and the poor.

A driver plowed a sedan forcefully up Arizona Avenue, which had flooded to knee height during a winter storm as high tide approached. The wake from the passing Honda buffeted low brick fences lining the tidy homes of working-class residents of this failing casino city, pushing floodwaters into Eileen DeDomenicis’s living room. DeDomenicis has lived in this house since 1982, a few hundred feet from a bay. She used to work as a restaurant server; now she’s a school crossing guard. La hausse rapide du méthane alarme les climatologues. La quantité de méthane dans l’atmosphère augmente de façon extrêmement rapide. Bien plus que prévu par les scientifiques. Un article publié en avril dans le journal Atmospheric Chemistry and Physics par un comité de 72 chercheurs fait état de cette augmentation inquiétante et de ses causes. Cette publication fait suite à deux articles publiés coup sur coup en décembre 2016 par la même équipe : l’un dressait l’inventaire mondial du méthane sur la période 2000-2012 tandis que le deuxième s’inquiétait du rôle croissant du méthane dans le changement climatique.

Après une stagnation entre 2000 et 2007, la concentration atmosphérique de ce gaz a crû chaque année de 5 partie par milliard (ppb/an). Les dernières données issues du réseau de référence de l’Agence américaine des océans et de l’atmosphère (NOAA) indiquent que ce chiffre est passé à 12.7 ppb/an en 2014 pour redescendre jusqu’à 9.45 ppb/an en 2016. Le « budget » planétaire du méthane. Source : Claire Lecoeuvre pour Reporterre. Antarctica’s collapsing ice shelf just sprouted a new crack. Winter has descended on Antarctica. Even as cold and darkness blankets the bottom of the world, the region’s most watched ice shelf is is continuing its epic breakdown. A crack started spreading across the Larsen C ice shelf in 2010, reaching 100 miles in length in February. Researchers with Project MIDAS, a British group monitoring the ice shelf, have spotted the first major change to the rift since then. A roughly six-mile crack branching off the main chasm recently formed, further altering the already unstable ice shelf.

The crack is expected to eventually cleave off 10 percent of Larsen C’s ice, an area roughly the size of Delaware. That loss will alter ice shelf dynamics and could speed the demise of the rest of the ice shelf, similar to what happened to neighboring Larsen A and Larsen B. The Larsen ice shelf complex is located on the Antarctic Peninsula, a roughly 800-mile stretch of land sticking out in the Southern Ocean like a tentacle. Is the climate consensus 97%, 99.9%, or is plate tectonics a hoax? | Dana Nuccitelli | Environment.

Four years ago, my colleagues and I published a paper finding a 97% consensus in the peer-reviewed literature on human-caused global warming. Since then, it’s been the subject of constant myths, misinformation, and denial. In fact, last year we teamed up with the authors of six other consensus papers, showing that with a variety of different approaches, we all found the expert consensus on human-caused global warming is 90–100%. Most of the critiques of our paper claim the consensus is somehow below 97%. For example, in a recent congressional hearing, Lamar Smith (R-TX) claimed we had gone wrong by only considering “a small sample of a small sample” of climate studies, and when estimated his preferred way, it’s less than 1%. But in a paper published last year, James Powell argued that the expert consensus actually higher – well over 99%.

We thus had three quite different estimates of the expert consensus on human-caused global warming: less than 1%, 97%, or 99.99%. So which is right?