Environmental Pollution

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Environmental Pollution And Forest Decline
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Claims of acid rain Naysayers during the
1980s General We dont need to control acid
rain 1. Rainfall is naturally acidic and most
sources of acid rain pre-cursors are natural
(volcanoes, swamps, etc.) 2. Gradual
acidification of lakes is a natural
phenomenon. 3. Some lakes are naturally acidic
and never supported fish populations. 4. Fish
stories.
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Effects of pollution and other human activities
on natural ecosystems Direct effects pollutants
like ozone that can injure organisms Cumulative
effects some pollutants accumulate in ecosystems
acid rain, toxic metals Additive effects of
other human activities e.g., introduced species,
forest harvest Interactive or synergistic
effects e.g., climate change interacts with soil
calcium depletion.
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Forest Decline The unusual and unexplained
mortality of forest trees
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Etiology of Forest Decline A Unifying
Concept 1. Predisposing factors -- natural,
chronic stresses (cold, wind, etc.) -- to
which we add pollution (ozone, acid rain, etc.)
2. Inciting factors -- extreme weather
events, like severe frost or drought --
climate change may make these more frequent 3.
Contributing factors -- native pests and
pathogens -- to which we add exotic pests and
pathogens
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