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I would like to hear some opinions on this.
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<blockquote data-quote="Jones" data-source="post: 269328" data-attributes="member: 4805"><p>I have. Most of what he posted is easily checked with a little intellectual curiosity and access to google.</p><p></p><p>Here's a couple of the more egregious errors to get you started:</p><p></p><p>Claims that volcanoes emit more CO2 than human activities are simply not true. In the very distant past, there have been volcanic eruptions so massive that they covered vast areas in lava more than a kilometre thick and appear to have released enough CO2 to warm the planet after the initial cooling caused by the dust (see <em>Wipeout</em>). But even with such gigantic eruptions, most of subsequent warming may have been due to methane released when lava heated coal deposits, rather than from CO2 from the volcanoes (see also <em>Did the North Atlantic's 'birth' warm the world?</em>). Measurements of CO2 levels over the past 50 years do not show any significant rises after eruptions. Total emissions from volcanoes on land are estimated to average just 0.3 Gt of CO2 each year – <a href="https://web.archive.org/web/20060821080831/http://www.bgs.ac.uk/programmes/landres/segs/downloads/VolcanicContributions.pdf" target="_blank">about a hundredth of human emissions (pdf document)</a>.</p><p></p><p></p><p>There is no correlation between solar activity and the strong warming during the past 40 years. Claims that this is the case have <a href="http://stephenschneider.stanford.edu/Publications/PDF_Papers/DamonLaut2004.pdf" target="_blank">not stood up to scrutiny (pdf document)</a>. Direct measurements of solar output since 1978 show a steady rise and fall over the 11-year sunspot cycle, but <a href="http://www.pmodwrc.ch/pmod.php?topic=tsi/composite/SolarConstant" target="_blank">no upwards or downward trend </a>.</p><p> Similarly, there is no trend in direct measurements of the Sun's ultraviolet output and in cosmic rays. So for the period for which we have direct, reliable records, the Earth has warmed dramatically even though there has been no corresponding rise in any kind of solar activity.</p><p></p><p>I realize that many people have made an emotional investment in denying the science surrounding this issue, so I'm under no illusions about changing anyone's position. Believe what you want.</p></blockquote><p></p>
[QUOTE="Jones, post: 269328, member: 4805"] I have. Most of what he posted is easily checked with a little intellectual curiosity and access to google. Here's a couple of the more egregious errors to get you started: Claims that volcanoes emit more CO2 than human activities are simply not true. In the very distant past, there have been volcanic eruptions so massive that they covered vast areas in lava more than a kilometre thick and appear to have released enough CO2 to warm the planet after the initial cooling caused by the dust (see [I]Wipeout[/I]). But even with such gigantic eruptions, most of subsequent warming may have been due to methane released when lava heated coal deposits, rather than from CO2 from the volcanoes (see also [I]Did the North Atlantic's 'birth' warm the world?[/I]). Measurements of CO2 levels over the past 50 years do not show any significant rises after eruptions. Total emissions from volcanoes on land are estimated to average just 0.3 Gt of CO2 each year – [URL='https://web.archive.org/web/20060821080831/http://www.bgs.ac.uk/programmes/landres/segs/downloads/VolcanicContributions.pdf']about a hundredth of human emissions (pdf document)[/URL]. There is no correlation between solar activity and the strong warming during the past 40 years. Claims that this is the case have [URL='http://stephenschneider.stanford.edu/Publications/PDF_Papers/DamonLaut2004.pdf']not stood up to scrutiny (pdf document)[/URL]. Direct measurements of solar output since 1978 show a steady rise and fall over the 11-year sunspot cycle, but [URL='http://www.pmodwrc.ch/pmod.php?topic=tsi/composite/SolarConstant']no upwards or downward trend [/URL]. Similarly, there is no trend in direct measurements of the Sun's ultraviolet output and in cosmic rays. So for the period for which we have direct, reliable records, the Earth has warmed dramatically even though there has been no corresponding rise in any kind of solar activity. I realize that many people have made an emotional investment in denying the science surrounding this issue, so I'm under no illusions about changing anyone's position. Believe what you want. [/QUOTE]
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