MODIS found coldest cloud tops yellow
See Article History Alternative Title: If geoengineering proposals are to influence global climate in any meaningful way, they must intentionally alter the relative influence of one of these controlling mechanisms. Geoengineering proposals were first developed in the middle of the 20th century.
Relying on technologies developed during World War IIsuch proposals were designed to alter weather systems in order to obtain more favourable climate conditions on a regional scale. One of the best-known techniques is cloud seedinga process that attempts to bring rain to parched farmland by dispersing particles of silver iodide or solid carbon dioxide into rain-bearing clouds.
Cloud seeding has also been used in attempts to weaken tropical storms.
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In addition, the U. This proposal, however, was not tested. Cloud seeding works on a regional scale, seeking to influence weather systems for the benefit of agriculture.
Present-day geoengineering proposals have focused on the global scale, particularly as evidence has mounted of increasing atmospheric CO2 concentrations and thus the prospect of global warming. Two fundamentally different approaches to the problem of global climate change have arisen.
This approach is more appealing than the first because it has the potential to counteract both rising temperatures and rising carbon dioxide levels.
In addition, reducing CO2 in the air could address the problem of ocean acidification. Vast amounts of atmospheric CO2 are taken up by the oceans and mixed with seawater to form carbonic acid H2CO3.
As the amount of carbonic acid rises in the ocean, it lowers the pH of seawater. Such ocean acidification could result in damage to coral reefs and other calcareous organisms such as sea urchins. Reducing the concentration of CO2 would slow and perhaps eventually halt the production of carbonic acid, which in turn would reduce ocean acidification.
To some scientists, global-scale geoengineering proposals border on science fiction. Geoengineering is also controversial because it aims to modify global climate—a phenomenon that is not yet fully understood and cannot be altered without risk.
In the popular press there have been reports that view geoengineering as the final option to thwart climate change if all other measures to reduce CO2 emissions fail in the coming decades.
Several studies advocate that rigorous testing should precede the implementation of any geoengineering proposal so that unintended consequences would be avoided. Each proposal described below would differ from the others in its potential efficiencycomplexity, cost, safety considerations, and unknown effects on the planet, and all of them should be thoroughly evaluated before being implemented.
Despite this, no proposed scheme has been purposefully tested, even as a small-scale pilot study, and hence the efficiency, cost, safety, or timescale of any scheme has never been evaluated.Earth Science Final Exam Earth Science Final Exam Test students' knowledge of earth science with a printable exam that includes short-answer, multiple-choice, and written-response formats.
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All of the Questions are from Exams 1,2, and 3. There are no Questions pertaining to the Diagrams so make sure to study those for the Final Exam.