[JohnZ]

While climatology is not my realm, the science laboratory is. When crunching data there are "must do's". The first step of data reduction and interpretation is verification of the measurements accumulated to date and assess inherent error (there is error in every measurement). How accurate were the temperature measurements that were acquired ....say....100 years ago? What instruments were used and what was the range of error associated with them? Were they accurate +/- one degree or perhaps more? That would be substantial error range I think. Would it be prudent to adopt a global strategy and commit tremedous resources at significant cost to industry worldwide especially at this time if there is even a shred of doubt at all? I think more very careful study is in order (as is being done now) and make national policy/regulatory change only until we are absolutely certain that global warming is indeed occuring due to human activity i.e greenhouse gas emissions and not just a natural phenomenon.

Food for thought: There is fossil evidence that supports the premise that planetary shifts are a natural occurence and that another ice age is destined for North America. Go figure.