 Any
visible or invisible particle or gas
found in the air that is not part of the
original, normal composition
 Natural: forest
fires, pollen, dust storm
 Unnatural: coal, wood
and other fuels used
in cars, homes, and factories for energy
 Smog: Fog
grabs smoke from coal
factories and traps it on the ground
 Global warming from excess CO2 from
the burning of fossil fuels
 Acid rain from sulfur dioxide, also from
the burning of fossil fuels
 Respiratory problems
 Agriculture
runoff - carrying fertilizers,
pesticides/insecticides/herbicides and
other pollutants into water bodies
 Accidental leaks and spills
 Plastic materials/wastes in contact with
water
 Intended/illegal discharges of waste
Death
of aquatic (water) animal,
Disruption of food-chains
Disease
Destruction of ecosystem
Water Pollution video clip
 The
process in an ecosystem
by which higher
concentrations of a particular
chemical, such as the
pesticide DDT, are reached in
organisms higher up the food
chain.
 Occurs
through a series of
predator-prey relationships
 Video clip
 Over-fishing
• 70% of world’s marine fisheries are over-
exploited.
• Affects food webs and habitat
 Fish farming is becoming increasingly
important as a source of fish production.
• Problems:
Nutrient overloads
Escape into natural waters
7