Test Your Knowledge: How Well Do Clean-Water Plants Recover Valuable Resources?

Here’s a quiz: What share of water, nutrients and energy do the nation’s clean-water plants recover? How close are we to a circular water economy?

We have come a long way since 1970. As I was entering college, an ad running frequently on TV touted a frozen pizza that came with a “toss-away pizza pan.”

Think of it. The most memorable feature of this product was not its ingredients, not its taste, but a disposable...

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