The tropics would expand.
Explanation:
With the global temperatures rising the Earth is projected to have multiple changes, climatic ones and even in the shape of the landmasses. Because of the rising global temperatures the ice at the poles is expected to melt, if not all than in solid amount, which in turn will rise the sea level.
Higher sea level will mean that there will be less land mass, but also that the land mass will be under bigger maritime influence when it comes to the climate. The ocean currents also are expected to gradually become dominated by warm ocean currents, while the cold ones will be much less and with much lesser global influence. That will cause expansion of the tropics, mostly toward north, as toward south there is little land mass, and such expansion will totally change the landscape, the habitats, the diversity and type of species present in certain areas.
