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focusclimat histoire
Since 1992, the IPCC has highlighted rising greenhouse gases, marking their ‘widespread and unprecedented’ impacts by 2014
Les fourneaux du monde brûlent maintenant environ 2 millions de tonnes de charbon par an. Lorsque le charbon est brûlé, qu’il est assemblé à l’oxygène, cela ajoute environ 7 millions de tonnes de dioxyde de carbone dans l’atmosphère chaque année. (…) Ceci tend à faire de l’atmosphère une véritable couverture plus ‘efficace’ pour la planète, ce qui a pour effet d’augmenter sa température. L’effet sera probablement considérable dans quelques siècles.
On September 14, 1869, 25,000 people marched through New York to celebrate the centennial of the birth of German scientist Alexander von Humboldt.
Years before the climate crisis was part of national discourse, this memo to the president predicted catastrophe
Long before the current political divide over climate change, and even before the U.S. Civil War (1861-1865), an American scientist named Eunice Foote documented the underlying cause of today’s climate change crisis. The year was 1856. Foote’s brief scientific paper was the first to describe the extraordinary power of carbon dioxide gas to absorb heat – the driving force of global warming. Carbon dioxide is an odorless, tasteless, transparent gas that forms when people burn fuels, including coal, oil, gasoline and wood.
Throughout Earth's history, CO2 is thought to have exerted a fundamental control on environmental change. Here we review and revise CO2 reconstructions from boron isotopes in carbonates and carbon isotopes in organic matter over the Cenozoic—the past 66 million years. We find close coupling between CO2 and climate throughout the Cenozoic, with peak CO2 levels of ∼1,500 ppm in the Eocene greenhouse, decreasing to ∼500 ppm in the Miocene, and falling further into the ice age world of the Plio–Pleistocene. Around two-thirds of Cenozoic CO2 drawdown is explained by an increase in the ratio of ocean alkalinity to dissolved inorganic carbon, likely linked to a change in the balance of weathering to outgassing, with the remaining one-third due to changing ocean temperature and major ion composition. Earth system climate sensitivity is explored and may vary between different time intervals. The Cenozoic CO2 record highlights the truly geological scale of anthropogenic CO2 change: Current CO2 levels were last seen ar
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