BridgeSmith said:
I said evidence, not predictions and guesses.
Some of it is just common sense. If you accept that the climate is warming then you accept the following:
a) You will have less artic ice because some will melt due to higher temperatures. Which should lead to higher sea levels. Simple logic.
b) You will have more moisture in the air because water evaporates faster at higher temperatures. Also, because the air is capable of holding more water when it is warmer. Again, it's simple logic.
c) More humidity SHOULD lead to more hurricanes (or a longer hurricane season) which are largely caused by the Coriolis effect in combination with warm waters and humid conditions.
d) More humidity in general means more precipitation in general.
Now, none of these things mean that there are "catastrophic" effects from global warming. Just common sense predictions based on what happens when temperatures increase.
You might also add some beneficial effects of global warming:
e) You should have longer growing seasons due to warming weather and more precipitation.
f) Longer growing season + more available water = larger food supply from farming. Where we'd be less likely to experience mass starvation in places like Africa and such which have had food supply issues in the past.
g) On the flip side, you will likely have more malaria and such diseases that spread better in warmer climates.