In what ways is climate change causing natural disasters?

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There are several different natural disasters that might emerge from the combination of global warming and ecosystem destruction. In no particular order, the following are all definite possibilities.
Melting of the Greenland and Antartica ice fields are both impacting ocean currents. These ocean currents are instrumental in determining rainfall patterns and local climates all over the world. If these currents shifts substantially, agricultural production will probably be dramatically impacted, very possibly in many parts of the world all at once. This would lead to massive food shortages and world-wide famines.
As the climate warms, the threat of pandemics carried by insects moving into new areas also increases. Some of the diseases have very high mortality rates and almost no effective treatments other than isolating the sick and palliative measures for the infected. If one of these diseases escapes to become a pandemic, we could have many millions of fatalities.
Ecosystem collapse, either on land or in the ocean, could have catastrophic impact on the human population because all life depends upon these ecosystems. For instance, the insect population seems to be only about 30% of what it was just a couple of decades ago. And the pollinators (which are necessary for a large fraction of our food) are in steep decline. Also, the ocean acidity is changing fairly dramatically and that poses a threat to sea life which we are also dependent upon.
Sea level rise, while slow compared to the disasters noted above, has the potential to displace roughly one third of the entire human population. When you combine that with parts of the globe becoming too hot for humans, we face the largest human migrations, by far, the world has ever seen. Given that the world is already struggling to deal with the refugees fleeing war and famine, this is a very grim scenario.
Forty percent of the world’s population is already struggling with inadequate drinking water. And global warming is already generating more extreme weather, both more frequent and longer droughts and more violent rain storms (ironically, storms that drop a lot of water in a short period of time are less helpful in restoring water supplies because more of the water runs off instead of sinking in to replenish aquifers and ground water). Shortage of water threatens to make some regions uninhabitable, thus generating more refugees.

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