Yeah, I read somewhere that hedgehogs like messy gardens with a pile of brush or something they can tootle around and unearth insects in.

A month or two later we had a hedgehog couple mating right next to our front door. Doesn't say much for our "front garden", but they sure were cute

As for the global warming thing: I'm convinced, but I'm also enough of a scientist to not rule out other explanations. My view is: global warming MAY turn out to be natural variation, but as long as most of the facts point towards mankind's influence, we can't afford to ignore it. We don't have the time to experiment.