Al Gore has also mentioned in numerous interviews that he has made his life carbon-neutral, and now he's announcing that "100 percent of the profits from the book and the movie [will go] to a new bipartisan educational campaign to further spread the message about global warming."

The window tax was a glass tax which was a significant social, cultural, and architectural force in the kingdoms of England, Scotland and then Great Britain during the 17th and 18th centuries. Some houses from the period can be seen to have bricked-up windows, as a result of the tax.

Glass making was costly and the use of glass for windows and other purposes was even costlier because of a tax levied specifically on it. The tax was introduced in 1696 under King William III and was designed to impose tax relative to the prosperity of the taxpayer, but without the controversy that then surrounded the idea of income tax. At that time, many people in Britain opposed income tax, on principle, because they believed that the disclosure of personal income represented an unacceptable government intrusion into private matters, and a potential threat to personal liberty. In fact the first British income tax was not introduced until the late 18th century and the issue remained intensely controversial well into the 19th century. Window tax was relatively unintrusive and easy to assess. The bigger the house, the more windows it was likely to have, and the more tax the occupants would pay.