A new article on the Scientific American web site about geoengineering as a response to global warming. Not something to take lightly by any means, but the pathetic rate of progress on this issue (we've known about this since the 1960s) may eventually leave us with this as the least-worst choice. And the debate about this approach is nowhere near as developed as it should be.
On a different note--real-life Sentinels. (In case you didn't get that, it's an X-Men reference.)