[mikepurvis]

Surely the one-time emissions in cement required to build a dam that lasts for decades amortizes down to nothing compared with the ongoing outputs associated with coal or gas fired electricity production? (not to mention the upfront emissions associated with constructing those facilities as well...)

Most of those global cement emissions are surely in building sidewalks, highways, bridges, and skyscrapers? Seems weird to blame an otherwise pretty green electricity source for this carbon.