If you come across a broken link, check for an archived copy.
This link no longer works: http://weblog.greenpeace.org/makingwaves/archives/2008/10/coal_gets_the_boot_in_the_gree.html
Use the Wayback Machine to view an archived version:
https://web.archive.org/web/20120318201527/http://weblog.greenpeace.org/makingwaves/archives/2008/10/coal_gets_the_boot_in_the_gree.html
Note that the most recent Wayback Machine archived versions didn’t yield readable versions of this page. You need to go back to crawls done in 2012 to find one that works.
Each individual crawl of a page is separate, so be persistent - one crawled version may be broken, and the next one may work.
You can use web archives to see what a website looked like at a specific point in time: