Global warming causes flucuations in the temperature of the earth. This makes weather conditions throughout the world more extreme. Storms and natural disasters will become more frequent and more severe, causing mass destruction and death. Droughts and harsh storms can destroy agricultural land as well.
The sudden change in temperature hurts all life on earth, including but not limited to humans. Organisms in the water are greatly affected by the change in ocean temperature, and are unable to survive in the new conditions. Climate changes for land plants and animals can also harm the wild life. The melting of the polar ice caps reduces habitat size for animals like penguins, polar bears, and seals.
Besides species extinction, this melting also causes a rise in the sea level. Coastal regions will flood, destroying more homes than Katrina or Rita. Storms over these warm waters will have even more power. The unpredictable weather will make it even harder to prepare and recover.
Since coastal populations will have to move inland, the increased population density will increase chances of disease, and epidemics will spread even faster.
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