evidence: Judith Curry: Well, there is almost certainly a signal of manmade emissions the earth climate. All other things being equal, it’s warmer than it would otherwise be. The real issue is the magnitude of man-made warming relative to the whole host of other things that go on in the natural climate system. And then the bigger issue is really whether this warming is dangerous. You know, a certain amount of warming is generally regarded by people as a good thing. But a whole lot of warming, isn’t especially a good thing, especially if it’s melting ice sheets and causing sea level rise.