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I haven't watched a new Bond movie in many years but I'd watch the hell out of the next one if you wrote the screenplay based on this idea.
Funny you should say that since that idea was spawned from a game I like to play called the Bond Supervillain Game. The object of the game is to come up with apocalyptic or near apocalyptic scenarios (which seem... er.... plausible enough) that CANNOT BE TRACED TO A SOURCE. Another idea: a fake communications satellite housing an ultradense metal ball (like a giant bullet) and either slighshotting it around the Moon or dropping it from orbit onto a bedrock of shale or some material that would create a cloud of dust that would envelop the Earth for, say, 10 years. Timing here is the key so you get a direct hit.