If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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I'd break this down into two questions:
For the first question, subsidising renewable energy is probably a good thing, but there's no reason to expect this particular opportunity to be up there with the world's best organizations. For the second it doesn't seem to me that it matters. So I'd say buy the normal stuff and give the difference to the best organization you can find.