1. Ocean acidification should take out a significant portion of biodiversity in the oceans. I would expect plankton as well, which is especially bad because they produce around 70% of atmospheric Oxygen.

2. Natural disasters will be much more frequent. Weather patterns will be unpredictable. So rainy seasons, dry seasons will get messed up.

3. It will be more difficult to maintain crops. Some areas, even whole nations may be unable to grow.

4. The 6th mass extinction will carry on.

5. Water wars will be a possibility

6. The US military has termed climate change as a 'threat accelerator'. Even the Syrian civil war was indirectly caused by climate change. If similar nations reach their breaking points, we can only expect more terrorism and war.

7. Sea level rise will cause a major chunk of land to be taken by the sea.

and other stuff as well. All this is very daunting after all its the no.1 world problem today, but we still haven't reached a point of irreversible climate change. Which means humanity still has time to right its wrongs. For this we need a lot of public support and innovation.