With so many factors coming into play, comparing impact on environment caused by various items is not easy. On this web site, we try to look carefully at the whole life cycle of the items, and figure out what resources are used and how much of pollution is created to produce, use, and dispose of the items. Look under the "Bottomline" tab on any item page to see the total amounts of every resource used and every pollution released. This is reasonably exact and reliable data, as we look into publications, books, Internet, and other sources to discover how items are produced, and how they are disposed of. [more...]