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Again, you're confusing individual lifestyle choices with an assessment and prediction of whether anything can be done. PK says nothing can be done. JZ says something can be done. What each is doing in their own personal lives is irrelevant on a grander scale, which is the level where things can be done..
Everyone knows that taking shorter showers or using CFL light bulbs or moving to a farm is not in and of itself going to save the planet. Collective large scale action is what got us into this mess, it's also what is going to get us out of it.