I believe the ramifications of "global warming" on the short term consist of deviation from our percieved historically normal trends, either colder or warmer than the normal seasonal forcast (we have only been taking daily weather readings for a century and a half, or so). Models show that once the main Antarctic ice sheet melts, this will change or even stop the worldwide conveyor system in our oceans, leading to competely different feeding cycles and lack of current food sources for marine animals as well as many more deoxygenated dead zones. I think global warming is a poor term. Climate change seems a more adequate descriptor.
Interestingly, scientist used the term "climate change."
Climatologists use the term "climate change" now instead of "global warming," because the Earth is an incredibly dynamic living planet. The Earth and all that is part of it has an amazing and almost endless ability to equilibrate. Although the overall outcome may be warmer temps across the board in the future, for now and probably the more immediate future, ocean storms and currents will affect our weather more harshly. This will lead to devastation from stronger, less predictable storms and fluctuating temps, aka "climate change." Changing jet streams and ocean currents can lead to this, and has.