Reader Dale Jensen incorrectly portrays rocket launches as being detrimental to the environment (AW&ST Oct. 1, p. 10). First, weekly space or missile test launches would have to be increased by many orders of magnitude to even earn a “trivial contributor” title. Second, all liquid-fuel engines actually burn very cleanly compared with most other of our industrial and transportation processes. All fuel is fully burned either in or beyond the engine, leaving no visible trail other than ...
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