Because Hansen wrote on NASA stationery, it becomes a public document, which we can view here. For that reason, I’ve posted a backup copy here, just in case the original disappears or changes. See hansen_letter.
Writing to Houghton Mifflin Company, Hansen asks for changes in the textbook to reflect what he considers to be the truth and consensus:
Apparently, there is no room for debate in the classroom on these issues. Apparently also there is no uncertainty. Hansen also makes a mention of “so called activist scientists”. I think he proved the point about activist scientists quite well with this letter.
What is most curious, is that in letters Hansen has written in the past, such as to the Prime Minister of Australia, he uses his home address in Kintersville on plain paper, and in his reply to a coal company executive on Columbia University stationery, but puts his NASA title on it. This makes me wonder how he chooses which stationery to write what letter on, and how to sign it.
Maybe it is just a byproduct of all that censorship by the Bush administration:
Source: Roger Pielke Jr. Prometheus