While I appreciate the efforts to curb global warming, I don't think the impact this would have is worth the offset needed to convert everything over to "black", mostly because CRT monitors are technologically a dying breed anyway. I doubt there will be any appreciable numbers of them still left in another decade.
Rather, it would probably be much easier just to convince people who have CRT monitors to download the Opera browser and check off the "View with High Contrast (W/B)" mode. This way, Opera overrides a lot of the CSS styling for the website without any additional work from the webmaster.
Here's what CD looks like when viewed in Opera with High Contrast (W/B) mode. It yields the same "black" effect without any additional work required to redesign the website.
