Abstract
CO2 receives such bad press in the context of global warming that it's sometimes hard to imagine it can actually be useful. Aside from its importance in photosynthesis, workers at CSIRO Forestry and Forest Products (Australia) aim to patent their use of ‘supercritical’ CO2 as a delivery system for preservatives into wood. Supercritical CO2 combines a liquid's capacity to dissolve materials with a gas’ ability to penetrate the micropores of timber, particularly in otherwise difficult woods. Unfortunately, upon reversion to the gaseous state, the CO2 goes back into the atmosphere. (http://www.csiro.au/page.asp?type=mediaRelease&id=Prsupercritical)
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