Well i'm going to tell you anyway!
The globe is actually warming overall (because of all the carbon and whatnot) but the effect of this is not always warmer weather for everyone.
The greatest effect that warming the globe has is the melting of the ice caps. As they melt, they release lots of fresh water into the oceans - resulting in the sea levels rising (something you may also have heard of, and why certain low-lying islands are a bit worried).
However, putting loads of fresh water into the oceans not only increases the depth of the oceans, it also changes the make-up of the ocean. Because the oceans are salty, adding fresh water to them actually makes them less salty (the amount of salt stays the same, but the water is increased, similar to watering down a glass of squash).
You would have thought that slightly less-salty oceans wouldn't be a bad thing, seeing as pretty much everything in the ocean works hard to remove the salt from it and fresher water is a good thing.
Nope! Changing the salinity of the water also changes it's density and therefore how warm and cold water react to each other.
Now, the reason why Britain has such a mild climate compared to other countries at the same latitude (such as Russia) is because of the Gulf Stream. This is a huge flow of warm water that flows up from the tropics in the Atlantic Ocean and dumps a lot of warmer water around the UK. It also brings with it some of the warmer weather that we are used to and explains why we are used to winters with an average temperature of 0C rather than -20C like Russia does.
The changes in salinity and density of the oceans is messing up the flow of the Gulf Stream, breaking it down and giving us shitty weather. This is most probably going to be permanent.
It is lame.