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<blockquote data-quote="roadrunner2012" data-source="post: 1329480" data-attributes="member: 40736"><p>oldngray, in case my lengthy case by case doesn't make it through moderation(no reason it shouldn't, but...), I would invite you to read the <a href="http://www.climatechange2013.org/images/report/WG1AR5_SPM_FINAL.pdf" target="_blank">Summary For Policymakers</a> from the IPCC. It puts out actual physical science evidence in a very easy to understand way.</p><p></p><p>You seem like a fairly reasonable person, maybe this will help you understand why the subject is so important.</p><p></p><p>Here are the highlights, quoted directly from the report:</p><p></p><ul> <li data-xf-list-type="ul">Warming of the climate system is unequivocal, and since the 1950s, many of the observed changes are unprecedented over decades to millennia. The atmosphere and ocean have warmed, the amounts of snow and ice have diminished, sea level has risen, and the concentrations of greenhouse gases have increased<br /> <br /> </li> <li data-xf-list-type="ul">Each of the last three decades has been successively warmer at the Earth’s surface than any preceding decade since 1850. In the Northern Hemisphere, 1983–2012 was likely the warmest 30-year period of the last 1400 years (medium confidence).<br /> <br /> </li> <li data-xf-list-type="ul">Ocean warming dominates the increase in energy stored in the climate system, accounting for more than 90% of the energy accumulated between 1971 and 2010 (high confidence). It is virtually certain that the upper ocean (0−700 m) warmed from 1971 to 2010 (see Figure SPM.3), and it likely warmed between the 1870s and 1971.<br /> <br /> </li> <li data-xf-list-type="ul">Over the last two decades, the Greenland and Antarctic ice sheets have been losing mass, glaciers have continued to shrink almost worldwide, and Arctic sea ice and Northern Hemisphere spring snow cover have continued to decrease in extent (high confidence).<br /> <br /> </li> <li data-xf-list-type="ul">The rate of sea level rise since the mid-19th century has been larger than the mean rate during the previous two millennia (high confidence). Over the period 1901 to 2010, global mean sea level rose by 0.19 [0.17 to 0.21] m.<br /> <br /> </li> <li data-xf-list-type="ul">The atmospheric concentrations of carbon dioxide, methane, and nitrous oxide have increased to levels unprecedented in at least the last 800,000 years. Carbon dioxide concentrations have increased by 40% since pre industrial times, primarily from fossil fuel emissions and secondarily from net land use change emissions. The ocean has absorbed about 30% of the emitted anthropogenic carbon dioxide, causing ocean acidification.<br /> <br /> </li> <li data-xf-list-type="ul"><strong>Total radiative forcing is positive, and has led to an uptake of energy by the climate system. The largest contribution to total radiative forcing is caused by the increase in the atmospheric concentration of CO2 since 1750.</strong><br /> </li> </ul></blockquote><p></p>
[QUOTE="roadrunner2012, post: 1329480, member: 40736"] oldngray, in case my lengthy case by case doesn't make it through moderation(no reason it shouldn't, but...), I would invite you to read the [URL='http://www.climatechange2013.org/images/report/WG1AR5_SPM_FINAL.pdf']Summary For Policymakers[/URL] from the IPCC. It puts out actual physical science evidence in a very easy to understand way. You seem like a fairly reasonable person, maybe this will help you understand why the subject is so important. Here are the highlights, quoted directly from the report: [LIST] [*]Warming of the climate system is unequivocal, and since the 1950s, many of the observed changes are unprecedented over decades to millennia. The atmosphere and ocean have warmed, the amounts of snow and ice have diminished, sea level has risen, and the concentrations of greenhouse gases have increased [*]Each of the last three decades has been successively warmer at the Earth’s surface than any preceding decade since 1850. In the Northern Hemisphere, 1983–2012 was likely the warmest 30-year period of the last 1400 years (medium confidence). [*]Ocean warming dominates the increase in energy stored in the climate system, accounting for more than 90% of the energy accumulated between 1971 and 2010 (high confidence). It is virtually certain that the upper ocean (0−700 m) warmed from 1971 to 2010 (see Figure SPM.3), and it likely warmed between the 1870s and 1971. [*]Over the last two decades, the Greenland and Antarctic ice sheets have been losing mass, glaciers have continued to shrink almost worldwide, and Arctic sea ice and Northern Hemisphere spring snow cover have continued to decrease in extent (high confidence). [*]The rate of sea level rise since the mid-19th century has been larger than the mean rate during the previous two millennia (high confidence). Over the period 1901 to 2010, global mean sea level rose by 0.19 [0.17 to 0.21] m. [*]The atmospheric concentrations of carbon dioxide, methane, and nitrous oxide have increased to levels unprecedented in at least the last 800,000 years. Carbon dioxide concentrations have increased by 40% since pre industrial times, primarily from fossil fuel emissions and secondarily from net land use change emissions. The ocean has absorbed about 30% of the emitted anthropogenic carbon dioxide, causing ocean acidification. [*][B]Total radiative forcing is positive, and has led to an uptake of energy by the climate system. The largest contribution to total radiative forcing is caused by the increase in the atmospheric concentration of CO2 since 1750.[/B] [/LIST] [/QUOTE]
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