News tagged with global warming
Related topics: climate change , carbon dioxide , greenhouse gas emissions , greenhouse gases , greenhouse gas
Global warming is the increase in the average temperature of the Earth's near-surface air and oceans since the mid-20th century and its projected continuation. Global surface temperature increased 0.74 ± 0.18 °C (1.33 ± 0.32 °F) during the last century. The Intergovernmental Panel on Climate Change (IPCC) concludes that increasing greenhouse gas concentrations resulting from human activity such as fossil fuel burning and deforestation are responsible for most of the observed temperature increase since the middle of the 20th century. The IPCC also concludes that variations in natural phenomena such as solar radiation and volcanoes produced most of the warming from pre-industrial times to 1950 and had a small cooling effect afterward. These basic conclusions have been endorsed by more than 45 scientific societies and academies of science, including all of the national academies of science of the major industrialized countries.
Climate model projections summarized in the latest IPCC report indicate that the global surface temperature will probably rise a further 1.1 to 6.4 °C (2.0 to 11.5 °F) during the twenty-first century. The uncertainty in this estimate arises from the use of models with differing sensitivity to greenhouse gas concentrations and the use of differing estimates of future greenhouse gas emissions. Some other uncertainties include how warming and related changes will vary from region to region around the globe. Most studies focus on the period up to the year 2100. However, warming is expected to continue beyond 2100 even if emissions stop, because of the large heat capacity of the oceans and the long lifetime of carbon dioxide in the atmosphere.
An increase in global temperature will cause sea levels to rise and will change the amount and pattern of precipitation, probably including expansion of subtropical deserts. The continuing retreat of glaciers, permafrost and sea ice is expected, with warming being strongest in the Arctic. Other likely effects include increases in the intensity of extreme weather events, species extinctions, and changes in agricultural yields.
Political and public debate continues regarding climate change, and what actions (if any) to take in response. The available options are mitigation to reduce further emissions; adaptation to reduce the damage caused by warming; and, more speculatively, geoengineering to reverse global warming. Most national governments have signed and ratified the Kyoto Protocol aimed at reducing greenhouse gas emissions. A small number of scientists dispute the consensus on global warming science.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
Childhood vaccines do not cause autism. Barack Obama was born in the United States. Global warming is confirmed by science. And yet, many people believe claims to the contrary.
Psychology & Psychiatry Sep 19, 2012 | 5 / 5 (1) | 1 |
An examination of the world's largest river basins found nutrient-rich and powerful river discharges led to spikes in the blooms of plankton associated with cholera outbreaks. These increased discharges often occur at times ...
Diseases, Conditions, Syndromes Aug 04, 2011 | not rated yet | 0 |
There may be different opinions about the causes of climate change, but experts say there is no denying its existence—and the effects are nothing to sneeze at. Researchers say global warming is leading to larger plants, ...
Immunology Mar 25, 2013 | not rated yet | 0
With this year's unseasonably warm temperatures and extended seasons, many have coined 2012 as being the worst for allergies. But if you thought your symptoms were worse than ever, just wait until the year 2040.
Immunology Nov 09, 2012 | not rated yet | 0
Physicians can and should help mitigate the negative health effects of climate change because they will be at the forefront of responding to the effects of global warming, argues an editorial in CMAJ (Canadian Medical Associati ...
Health Feb 04, 2013 | not rated yet | 0
Social scientists are struggling with a perplexing earth-science question: as the power of evidence showing manmade global warming is rising, why do opinion polls suggest public belief in the findings is wavering? Part of ...
Psychology & Psychiatry Apr 06, 2011 | 5 / 5 (4) | 1