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Reading Danny Westneat’s column on being green, I have often wondered why, if we are trying to cut emissions, we don’t require more solar power on homes.

With solar power, or green roofs, we would use less electricity, which would surely be a good thing. Or copy some, or all, of the practices used on the Bullitt Center in Seattle.

We know the techniques, why don’t we require them to be used?

Glen Day, Seattle