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Discussion and Debate
Discussion and Debate
Physical & Life Sciences
We can't reverse manmade climate change.
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<blockquote data-quote="OldWiseGuy" data-source="post: 73793562" data-attributes="member: 139156"><p>Just did some reading on the topic. It seems that desert areas create high pressure zones above them which act to drive moisture/clouds away, thus the lack of rainfall, thus the term <em>desert.</em> The heat reflected upwards by the earth/sand is what is being measured. It is heat radiating from the earth and back into space.</p><p></p><p> If large amounts of water were introduced into the deserts the resultant water vapor, a very efficient greenhouse gas, would trap heat in the atmosphere. The more water added the more the greenhouse effect. So the idea of afforestation or other cultivation through irrigation of the (Sahara) desert would be disastrous regarding global warming, at least in the short term.</p><p></p><p> I once demonstrated the powerful thermal effect of rising hot air to a friend that I invited along for an airplane ride. We were flying at about 3000 feet AGL (above ground level) over huge dark green fields of late summer corn, cut occasionally by narrow farm roads. Spotting the thin yellow line of a crushed gravel road I told my friend to prepare for a 'bump' as we flew over the road, barely visible below. As we crossed it the Cessna 150 indeed sustained a good bump from the rising narrow thermal, as if an unseen foot had kicked us in the bottom. The strength of the bump on that hot summer day surprised even me. I have no doubt that the thermal could have been felt several thousand feet higher as well.</p></blockquote><p></p>
[QUOTE="OldWiseGuy, post: 73793562, member: 139156"] Just did some reading on the topic. It seems that desert areas create high pressure zones above them which act to drive moisture/clouds away, thus the lack of rainfall, thus the term [I]desert.[/I] The heat reflected upwards by the earth/sand is what is being measured. It is heat radiating from the earth and back into space. If large amounts of water were introduced into the deserts the resultant water vapor, a very efficient greenhouse gas, would trap heat in the atmosphere. The more water added the more the greenhouse effect. So the idea of afforestation or other cultivation through irrigation of the (Sahara) desert would be disastrous regarding global warming, at least in the short term. I once demonstrated the powerful thermal effect of rising hot air to a friend that I invited along for an airplane ride. We were flying at about 3000 feet AGL (above ground level) over huge dark green fields of late summer corn, cut occasionally by narrow farm roads. Spotting the thin yellow line of a crushed gravel road I told my friend to prepare for a 'bump' as we flew over the road, barely visible below. As we crossed it the Cessna 150 indeed sustained a good bump from the rising narrow thermal, as if an unseen foot had kicked us in the bottom. The strength of the bump on that hot summer day surprised even me. I have no doubt that the thermal could have been felt several thousand feet higher as well. [/QUOTE]
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We can't reverse manmade climate change.
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