An interesting letter from Lord Kelvin to John Clarke. In 1860, Kelvin proposed that an increase in CO2 emissions from coal-burning would raise global temperatures much like how a greenhouse works. What's even more interesting is that he considered doing this intentionally to "provide a very comfortable living environment" for the people of Glasgow.
In the end he decided better of it, considering both the havoc it would cause for non-Glaswegians and, more importantly, the potential danger of introducing malaria to a more tropical Glasgow. "We have quite enough pestilence here, I contend, without inviting another!"
UPDATE: The above letter is fiction. Disregard.
Also, while making the Lord Kelvin library a little more respectable looking (still a work in progress), I found this:
La Bibliothèque nationale de France (that's French for "the French National Bookatorium") has a large collection of scanned books, etc. in PDF format (available one excruciating page at a time). The collection is searchable ("search" in French is "recherche,") by author, title, subject, and full text contents. You'll probably find something to interest you there. There's certainly lots of Kelvin stuff, from a seemingly complete collection of "Proceedings of the Royal Society of London" to his various reprint volumes. There's no way I'm going to retype all that (although I did manage to partially patch up one of the incomplete papers I had), so just go there and look for yourself.