The Problem with multiple goals

Greenpeace is apparently against inclusion of forest conservation in a market-based mechanism for reducing greenhouse gases (GHGs) on the grounds that industry will continue spewing carbon offset by avoided deforestation carbon credits. I think that if your goal is to reduce overall carbon emitted, you should actually be pleased that industry can find a source that is both cheap and helps preserve the natural habitat. Greenpeace is caught between its twin goals of reducing overall carbon emissions *and* reducing industrial emissions in particular, and it is clear that the two goals are not always aligned.