I fail to understand how any scientist or engineer who has done the research can come to any other conclusion than what Burt Rutan has.
If they have come to a different conclusion, it is based upon cherry picking the data to support emotion, wishful thinking, politics, environmental opportunism, a quest for GW grant money or perhaps not to lose the friendships of their pals on the left who worship in the GW congregation..
Honestly, I did not read you post before I made mine, lol