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All of the following are ways dams affect climate change EXCEPT
hydroelectric dams can reduce our dependence on fossil fuels which would reduce carbon dioxide emissions.
if a forest is cut down to make way for a dam and reservoir, those trees are no longer available to absorb carbon dioxide.
as vegetation decays beneath reservoirs, it releases carbon dioxide.
as vegetation decays beneath reservoirs, it releases methane.
dams prevent fish from migrating to spawning grounds further up river.