Home Energy Magazine Online 2009 OBP Program Review Portal - welcome page Gateway to the UN System's Work on Climate Change - The Earth's Changing Climate Warming more and faster — The rate of warming of the Earth’s average surface temperature over the last 50 years was nearly twice the rate for the last 100 years. Over the past 100 years, the Earth’s average surface temperature rose by around 0.74°C. If atmospheric concentrations of the dominant greenhouse gas, carbon dioxide, were to double compared to pre-industrial level, this would lead to an average warming of around 3°C. The late 1990s and early 21st century had the warmest years since modern records began. Arctic sea ice has been shrinking on average by 2.7 per cent per decade. Evidence of warming — The changes that scientists can measure in the atmosphere, oceans, ice caps and glaciers conclusively indicate that the world is already warming in response to past greenhouse gas emissions. Less glaciers, snow and ice — One of the most dramatic consequences of global warming is sea-level rise. Next page>>>
EcoGeek - Brains for the Earth Comitê de Monitoramento do Setor Elétrico (CMSE) O Comitê de Monitoramento do Setor Elétrico (CMSE) reuniu-se, nesta segunda-feira (17.08), para avaliar as condições de atendimento eletroenergético do Sistema Interligado Nacional (SIN). Na reunião, o Operador Nacional do Sistema (ONS), responsável pelos estudos de avaliação do atendimento, apresentou as condições climáticas das principais bacias hidrográficas do país. A região Sul registrou precipitações excepcionais, elevando a energia média nas primeiras semanas de agosto para 19.304 MWmédios, valor muito superior ao do período da estiagem de maio,que foi de 2.200 MWmédios. A previsão climática para agosto, setembro e outubro indica que a precipitação deve variar entre a média histórica e valores acima desta nas bacias dos rios Uruguai, Iguaçu, Paranapanema e Tietê e próxima da média nas demais bacias do SIN. O Ministério de Minas e Energia apresentou um balanço das obras de expansão da geração e transmissão em todo o território brasileiro.
Impacts of climate change on the marine environment Marine species affected by climate change include plankton - which forms the basis of marine food chains - corals, fish, polar bears, walruses, seals, sea lions, penguins, and seabirds. The Intergovernmental Panel on Climate Change predicts a further rise of between 1.4°C and 5.8°C by the end of the century. Climate change could therefore well be the knock-out punch for many species which are already under stress from overfishing and habitat loss. The key impacts of climate change on the marine environment are... Coral bleaching One of the most visually dramatic effects of climate change is coral bleaching, a stress response caused by high water temperatures that can lead to coral death. Recent years have seen widespread and severe coral bleaching episodes around the world, with coral mortality reaching 70% in some regions. More on coral bleaching Stormy weather Most scientists believe that global warming will herald a new era of extreme and unpredictable weather. More on extreme weather
California Cars Initiative for Plug-In Hybrids PLANO NACIONAL DE AGROENERGIA 2006 - 2011 Énergie solaire Un article de Wikipédia, l'encyclopédie libre. Rayonnement solaire direct. Répartition de l'énergie solaire moyenne reçue au sol L'énergie solaire est la fraction de l'énergie du rayonnement solaire qui apporte l'énergie thermique et la lumière parvenant sur la surface de la Terre, après filtrage par l'atmosphère terrestre. Sur Terre, l'énergie solaire est à l'origine du cycle de l'eau, du vent et de la photosynthèse réalisée par le règne végétal, dont dépend le règne animal via les chaînes alimentaires. Cet article traite de l'énergie produite par l'homme en captant le rayonnement émis par le Soleil, principalement sous forme électrique ou thermique. Historique[modifier | modifier le code] L'utilisation de l'énergie solaire remonte à l'Antiquité. Le Français Salomon de Caus construit en 1615 une pompe solaire, grâce à l'utilisation d’air chauffé par le rayonnement solaire. En 1747, Georges-Louis de Buffon expérimente un miroir qui concentre la lumière du soleil en un seul point focal.