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.

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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