What Killed the Dinosaurs?

Things are always more complicated than you would like. With the demise of the dinosaurs you chose either the Chicxulub impact or the Deccan traps. If you were being boringly rational you would say both. 

THIS PAPER describes a computer exercise to determine whether the Deccan Traps were sufficient to do the job by themselves. And comes to the conclusion that they could. Of course they say that the coincidental timing of the asteroid did not help the dinosaurs, but they would have died out anyway. (To read the full paper you need to be subscribed.)

If, like me, you do not have a subscription, read THIS ARTICLE, which gives details of the work and reactions to it from both pro-volcano and pro-asteroid camps. Well worth reading!