What can be said about diapers in landfills?

Diapers in landfills are a major pollution problem. Here's a quote from the website of the Clean Air Council:

An average child will use between 8,000 -10,000 disposable diapers ($2,000 worth) before being potty trained. Each year, parents and babysitters dispose of about 18 billion of these items. In the United States alone these single-use items consume nearly 100,000 tons of plastic and 800,000 tons of tree pulp. We will pay an average of $350 million annually to deal with their disposal and, to top it off, these diapers will still be in the landfill 300 years from now. Americans throw away 570 diapers per second. That's 49 million diapers per day.

Source: http://www.cleanair.org/Waste/wasteFacts.html