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Brad Plumer

For Brad Plumer's latest contributions to The Japan Times, see below:

Engine economics limit biofuels in U.S.

| Nov 17, 2013

Engine economics limit biofuels in U.S.

When it comes to ethanol, the United States may have reached its limit — at least for now. In 2007, Congress passed a law that would require the nation to use more ethanol and other biofuels each year. But for reasons of chemistry and economics, ...

Space trash tax eyed

/ | Oct 25, 2013

Space trash tax eyed

Space is getting awfully messy. The amount of debris in Earth's orbit keeps multiplying each year, damaging satellites and putting astronauts in harm's way. If the problem gets severe enough, it could eventually make low-Earth orbit unusable. Scientists have known about the space trash problem ...