What problems does global warming cause?

The Earth heats up and its sea levels rise. This provides more energy for storms, which then become more violent. We don't predict an increase in their frequency, just in their average strength.

Warmer temperatures also promote the geographic growth and redistribution of tropical diseases like malaria, and pests like africanized honey bees. Some areas of the planet are expected to suffer more frequent and prolonged drought, while a few areas are likely to receive greater rain fall, potentially increasing flooding.