Coral reefs. Too hot water, corals die.
Polar bears. No ice flakes to climb up on when swimming in the sea, hunting. Polar bear drowns mid-sea after several hours of looking for something solid to grab on to.
Tons, I repeat, tons and tons of plancton, the very basis of the food chain. Too warm water, plancton get heat stroke, die by the trillions. Next step up is smaller fish, then bigger fish... the seas are dying.
Some animals naturally thriving in a mild climate creep further north as the winters get shorter. Take the Iberia snails, for example. Usually, they will freeze to death in a Norwegian winter. However, as the winters get milder, the snails survive. And lay up to 400 eggs each. They are becoming a major problem up here now, and their only natural enemy, a dry climate, is nowhere to be seen.
Forest fires rage in Australia. Koala bears are fried. Eucalyptus trees are fried. A tree has to be more than 20 years old for providing sufficent food for a koala without taking damage from it. For each fire that rages, a huge patch of trees are uninhabitable for twenty years.
Drought. Have a look at Ethiopia. People are dying by the thousands there, because the summers bring a lot less rain than usual.
Glaciers going bye-bye. India, China, Nepal, Bhutan, Pakistan... where do you think their inner regions are getting their water from? What happens when precipitation falls as rain, that runs away, instead of snow that stays on the glacier?
Global warming is killing things. And the rate is growing. Wait until the humanitarian crisis are escalating to the point that people start to emigrate. Not by the thousands, like today, but by the hundreds of millions. Diseases run like wildfire in slum areas, growing because lack of rain makes running a farm impossible, and people move to the cities.
Then you have the permafrost melting. Entire cities in Russia are built over huge networks of mines and tunnels. Permafrost melts, tunnels cave in... and on the surface, entire blocks are swallowed by holes in the ground.
Close your eyes, if you so wish. It won't be as bad where most CF-ers live. The weather will actually get better here. Thus, you can already adapt to foreign immigrants. As entire countries are getting uninhabitable, we can expect tons more of them in the future. And as stated above, the seas will yield less food in the years to come.
Last, if the trend continues at today's rate, we'll see WW3 in this century. It will be about fresh water.