5.

5.1
5.2
5.3

5.1

Projected changes in climate are expected to have both beneficial and adverse effects on water resources, agriculture, natural ecosystems and human health. But the larger the changes in climate the more the adverse effects should dominate.

For instance, some crop and forest productivities could benefit from a small climate change. But for many other natural systems, the adverse effects should be dominant, especially if warming exceeds a few degrees.

5.2

Human populations are expected to face increasing flooding and heat waves but reduced cold spells. The geographic range for infectious diseases should increase.

5.3

The vulnerability of human populations and natural systems to climate change differs substantially across regions and across populations within regions.