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"Changes to Earth's climate driven by increased human emissions of heat-trapping greenhouse gases are already having widespread effects on the environment: glaciers and ice sheets are melting, river and lake ice is breaking up earlier than usual, and plant and animal geographic ranges are shifting." (Source: NASA website)
Drought can weaken trees and make a forest more vulnerable to wildfire or insect outbreaks.
Also, wildfires caused by rising temperatures can make a forest more vulnerable to pests.
Land development, could decrease a forest's ability to adapt, therefore less trees growing