Q: What proportion of municipalities in the United States currently do some sort of recycling or composting?

Platt: There are about 4,000 curbside recycling programs. This is a significant increase from a few years ago. In 1990, about 17% of municipal waste was recycled. That's up from 10% a few years ago. So there's been a significant increase over the last few years. In terms of tonnage, recycling has gone from 16 million tons in 1985 to 33 million tons in 1990.

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