Have $200,000 to spend on a seat into space? You may want to re-think the expenditure given a new study in Geophysical Research Letters that shows space tourism will likely aggravate global climate change. Using sophisticated modeling, the researchers found that the biggest impact of a rise in space tourism on global temperatures won't be due to carbon emissions, but black carbon, often in the form of soot.
Produced from the incomplete combustion of burning fossil fuels or biomass, black carbon in the atmosphere absorbs sunlight and emits it as heat. When produced on terra firma, say from burning forests or diesel, black carbon particles stays in the atmosphere for a few days or weeks. However soot particles emitted from space rockets would have a longer-term impact, since they remains in the stratosphere for years.
"Rockets are the only direct source of human-produced compounds above about 14 miles [22.5 kilometers] and so it is important to understand how their exhaust affects the atmosphere," said Martin Ross of The Aerospace Corporation in El Segundo, California and the study's lead author.
"The response of the climate system to a relatively small input of black carbon is surprising, and our results show particular climate system sensitivity to the type of particles that rockets emit," adds co-author Michael Mills of the National Center for Atmospheric Research in Boulder, Colorado.
Found:
http://www.enn.com/pollution/article/41924
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