Actually, this global warming may lead to a period of much much colder weather all over the world...The warming is melting glaciers and icebergs which are speculated to be the reason for the high levels of fresh water in the northern seas. What usually happens is that warm salt waters from the gulf stream reach higher latitudes, they give up much of their heat to the atmosphere, causing warmer weather. Once they keep going northward and have given off all of their heat, the waters become dense and it sinks way down into the ocean. This is what runs what we call 'the great ocean conveyor' once this water has sunk, new water from the gulf stream must be drawn up to replace the sunken water. But the northern oceans have been seeing increasing levels of fresh water, they are not positive of the cause, but if it keeps up, the fresh water doesnt sink like the salt water does, so this blocks the ocean conveyor. Bottom line, if it gets blocked, northern areas of the world could see an average temperature decrease of 5-10 degrees fahrenheit. The great ocean conveyor has been blocked in the past... it could do it again....
PEACE
DREW
'Life without knowledge is death in disguise.'
    --Talib Kweli