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Global Warming

Global Warming
Related:  The Climate Crisis

Jared Diamond Effondrement Ingénieur agronome, Daniel Tanuro a signé dans Le Monde diplomatique de décembre 2007 une critique du livre de Jared Diamond Effondrement [1]. A la suite de cette publication, de nombreux lecteurs nous ont écrit pour nous faire part de leur indignation. Ils jugent injustifié le procès fait à ce scientifique et militant écologiste renommé qu’est Jared Diamond. D’où ce forum, destiné à leur permettre de débattre directement avec l’auteur de l’article. Parmi les courriers reçus, celui de Colin Sanchez, reproduit dans le courrier des lecteurs du Monde diplomatique de janvier 2008 ; mais aussi, par exemple, celui de Bernard Thierry, biologiste au Centre national de la recherche scientifique (CNRS), qui écrit : Par le passé, des sociétés humaines ont probablement disparu parce qu’elles avaient détruit leur milieu naturel en exploitant ses ressources au-delà de ce qu’il pouvait supporter. Tuer le messager pour ne pas entendre le message Mais il y a plus préoccupant. M. M. M.

Bill McKibben - Global Warming's Terrifying New Math If the pictures of those towering wildfires in Colorado haven't convinced you, or the size of your AC bill this summer, here are some hard numbers about climate change: June broke or tied 3,215 high-temperature records across the United States. That followed the warmest May on record for the Northern Hemisphere – the 327th consecutive month in which the temperature of the entire globe exceeded the 20th-century average, the odds of which occurring by simple chance were 3.7 x 10-99, a number considerably larger than the number of stars in the universe. Meteorologists reported that this spring was the warmest ever recorded for our nation – in fact, it crushed the old record by so much that it represented the "largest temperature departure from average of any season on record." The same week, Saudi authorities reported that it had rained in Mecca despite a temperature of 109 degrees, the hottest downpour in the planet's history. Not that our leaders seemed to notice.

How Climate Change Endangers Microbes--And Why That's Not a Good Thing With another year of record-breaking warmth just over, the passage of a new climate treaty is definitely timely. But even if these new diplomatic and legislative efforts are successful the planet is ensured some amount of long-term warming—enouigh that around 8% of species are likely to go extinct due to climate change. If the warming is greater than current models project, that number could double. In all likelihood, though, those numbers are an underestimate, because there are species that no climate scientists are keeping track of. There are currently no published studies of how climate change may cause extinction of microbial species. In experiments at the Harvard Forest, for example, long-term artificial warming led to reductions in both total and active microbial biomass as well as to changes in how the soil community behaved1. An alternative way of studying microbial sensitivity is to transplant intact communities to warmer sites. References: 1. 2. 3. 4.

CO2-Gehalt in der Atmosphäre auf Rekordniveau 11.05.2013 12:51 Uhrvon Dagmar Dehmer Bild vergrößern Mit 400 ppm (Teilchen pro einer Million Teilchen) CO2 überschreitet der Anteil des Treibhausgases ein Niveau, das zuletzt im Zeitalter des Pliozän erreicht wurde. Wenn die Industrie- und Schwellenländer nicht bald damit anfangen, ihren Treibhausgasausstoß massiv zu senken, ist das Zwei-Grad-Ziel bald nur noch mit gewaltigen Kosten erreichbar. Als die Kohlendioxid-Konzentration in der Erdatmosphäre zuletzt 400 ppm (parts per million, 400 CO2-Moleküle auf eine Million Luftteilchen) erreicht hatte, gab es auf der Erde noch keine modernen Menschen. Am Donnerstag Abend haben die amerikanische Ozean- und Atmosphärenbehörde (NOAA) und die Scipps Institution für Meereskunde auf Hawaai zum ersten Mal einen Tages-Durchschnittswert von 400 ppm CO2 in der Atmosphäre gemessen. Der CO2-Gehalt in der Atmosphäre erreicht im Mai ihren Höhepunkt.

Big Data Predicts Centuries Of Harm If Climate Warming Goes Unchecked The heart of NASA Center for Climate Simulation in Maryland is the "Discover" supercomputer. The software programs behind climate simulations typically have 1 million lines of code, or more. Pat Izzo /NASA hide caption toggle caption Pat Izzo /NASA The heart of NASA Center for Climate Simulation in Maryland is the "Discover" supercomputer. The software programs behind climate simulations typically have 1 million lines of code, or more. Pat Izzo /NASA As diplomats argue in Paris over a new global agreement to fight climate change, their work is driven by scientists' dire predictions of how unchecked warming will transform our planet decades and centuries from now. But how can researchers be so sure of what will happen that far off? The Earth is big and its climate is complicated. And when the center runs a climate simulation, he says, it can take months for this powerful beast to spit out an answer. How Might Climate Shift? Plus, Duffy says, "we store large amounts of climate data."

the consensus project Impacts of Global Warming on the Environment | UCAR - University Corporation for Atmospheric Research Findings from the 2007 IPCC report The 2007 IPCC report examined data on numerous changes to natural systems that have already been observed, as well as the potential for future impacts. A climate that's already changing Current environmental impacts and prospects for the future Changes in weather Heat and heat waves Rain, snow, and drought Stormy weatherChanges in ecosystems Polar and mountainous regions Plant life Wildlife Related FAQ What is the Intergovernmental Panel on Climate Change (IPCC)? A climate that's already changing Climate is always changing, but the changes we've observed in the last several decades are best explained as a combination of natural and human-made causes. The first IPCC report, issued in 1991, discussed changes we could expect decades in the future. Some of the trends now under way—such as warmer nights during heat waves and heavier bursts of rain and snow—are expected to continue. View an interactive map of potential impacts of climate change. back to top

Climate Change Alarm is Needed