Guest opinion: Dr. Tim Ball 
The article “US Senate Considering Albedo Modification Geoengineering Proposal”appeared as I finished this article. It commented on the plan to introduce particles into the atmosphere to increase the reflective capability of the Earth’s atmosphere known as the albedo. Most responses correctly identified it as unwise. Isn’t it already happening? Jet contrails from commercial airline flights reduce the amount of sunlight that makes it to the surface, as this satellite image shows:
The Senate proposal is not new. In 2009, John Holdren pushed the same idea as a Daily Mail story headlined “Obama may fire pollution particles into stratosphere to deflect sun’s heat in desperate bid to tackle global warming” (Figure 1).
The controversial experiment was touted yesterday as a possible last resort to help cool the Earth’s air by the president’s…
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