[dcb]

I think generally speaking, our understanding of such things is improving over time. Models get refined, new discoveries and techniques made. I agree with the side of caution as being a reasonable one, since there is a lot of uncertainty here. There are some hard facts about emissions and population growth and efficient use of resources that we have to deal with regardless. And just because these may turn into someone elses problem, doesn't mean we should make every effort to remain ignorant of the issues. It will take time to get a good understanding, and the results are independent of any non-disciplined belief system/or convenience bias. And even then the results are only assessed as being a "likely" explanation or not and subject to further revision, as it should be.