The over-hunting of
sardines has caused higher levels of phytoplankton in the ocean. While living,
phytoplankton release oxygen into the atmosphere and use Carbon for
photosynthesis.
When they die, their
decay releases large amounts of methane and the poisonous gas, hydrogen
sulfide. It also uses large amounts of
oxygen.
Methane is 21 times more effective
than carbon dioxide in maintaining heat in the atmosphere.This results in the
deaths of numerous marine animals.
Effects of global warming
•
More carbon
dioxide -> increase in plant growth.
•
The increase
in temperature -> rise in sea level
from melting glaciers and polar ice caps
(adds 0.2 mm annually)
•
Rising
temperatures will also cause drier conditions in many important agricultural
regions.
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