But the Tokelauans say the main factor is concern over climate impacts, and a desire to show it can be done.

BBC: Tokelau plans an all-renewables future

But for all its concern over climate change, Europe doesn't have a lot to show for it yet.

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The latter has a 4% yield with a good track record of increases, and has been met with skepticism of late over concern that the device world is passing it by as consumers show a taste for smartphones and tablets.

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