Global warming is real, but it is a naturally occuring effect rather than one we have made ourselves. Of course, we contribute to it. We are coming out of the last ice age so it is going to happen anyway, we are just accelarating it.
In the UK, for years now we have had colder summers and warmer winters. I say this, as i mean about 50 years ago, we would be knee-deep in snow at december and it was much colder and we'd have a nice hot summer.
We clearly do not have this anymore as the climate is changing due to the global temperature increasing.. we are seeing the merging of seasons. The weather is just slightly colder in winter, but the actual weather isn't much different. It's the icecaps melting that will cause most of the problems, and from what i can gather.. more violent storms, hurricanes, tsunamis and that kind of thing.