I just don't think people really understand the consequences of the Earth's temperature rising just a few degrees along with a higher concentration of CO, CO2, and methane. Maybe it's due to uninformed hyperboles from both sides of the argument.
Here's what's happening now:
Ocean acidification- CO2 dissolves into the ocean to create carbonic acid, which lowers ocean PH. Fortunately the ocean has a natural buffer chemical reaction to stabilize pH levels, by converting carbonic acid and calcium into calcium carbonate. The problem is there is such an immense amount of CO2 in the atmosphere and dissolved the ocean that calcium sources are depleting and ocean pH is lowering.
The consequence of an acidic ocean? Well most easily recognizable consequence is the degradation of coral reefs, which are centers of high diversity (lets face it, no rednecks on here will care about), but also the highest centers of photosynthetic productivity in the world.
Here's an interesting fact, phytoplankton and symbiotic algae within corals produce more oxygen than all of the land plants in the world combined! So elimination of coral reefs has quite obvious and even more serious consequences to all life on earth.
What remains is ocean desalination, global warming, and atmospheric air current alteration. These are only the few consequence we actually know about because scientists are observing these phenomena taking place. I'll explain these others later when I have the time.