Cardinals are forced to migrate early because of the rapid weather change in all of there regular habitats. This is caused by Global Warming.
Cardinals Regular habitats are parts of Mexico and most of East coast of North America.
The climates in these places are usually a mixture of hot, mild, cold, and rainy climates.
Global Warming is the trapping of heat in the Earth's atmosphere and the increase of carbon dioxide and other pollutants in the atmosphere.
This is an example of pollution being put in the air.
Cardinals are forced to move from place to place because of the high heat in many places they go. This is caused by Global Warming.
Another way Cardinals are effected by Global Warming is how they are forced to migrate early because of the cold temperatures that come earlier they usually in their habitats.