Trials of more dynamic tariffs report mixed success—and almostall of those have involved green-minded volunteers, not busy families.

而这其中更为动态税费适用成功的报道显得复杂——这其中多数是绿色理念的志愿者，而不是那些忙碌的家庭。

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But critics argue that these green tariffs aren't as effective as switching to a green supplier.

BBC: 28 MARCH

We agreed to reduce tariffs on environmental goods and make it easier to export clean energy technologies that create green jobs.

WHITEHOUSE: President Obama Holds a Press Conference at the APEC Summit

As feed-in tariffs expand to countries around the world, allowing early adopters a premium price for the green electricity they generate and sell back to the grid, the collection technologies will become ever more efficient and cheaper.

FORBES: Jeremy Rifkin's Third Industrial Revolution