To those interested in trying to stop — or at least slow down — climate change, the 2009 Climate Change Summit in Copenhagen, which was dubbed “Hopenhagen” before it began, is remembered today as “Brokenhagen.” The summit’s failure to come to any kind of agreement was a key factor in pushing climate change activists away from working within governmental channels and towards direct action fights, like Keystone.

Why did Brokenhagen happen? Was it just a clash of expectations? Too many cooks in the climate accord kitchen? Was it bad behavior by China? The U.N.? The Senate?

Now we can add one other potential culprit to the Agatha Christie mystery that was Copenhagen: spying.