The extreme heat waves of 2003 killed up to 70,000 people in Europe. These type of catastrophic temperature changes will most likely become an increasingly regular occurance.
An increase in the amount of carbon dioxide in the air increases the risk of allergy and asthma for humans. Air pollution and increased pollen tends to make allergies worse. They also tend to increase smog in heavily industrialized urban settings 2.
As weather patterns become more unpredictable and the potential for extreme weather events increase, species on planet earth will experience an increase in deaths, injuries, infectious diseases, and stress-related disorders 3.