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22-2: ENVIRONMENTAL ISSUES

Pollution Putting substances that cause unintended harm into the air, soil, or water

GREENHOUSE AFFECT

the ability to trap heatkeeps our planet warm and habitable

GLOBAL WARMING

Excess CO2 released from burning of fossil fuels

Possible correlation between temperature and CO2 levels

Adds to the “greenhouse” to trapping heat

Estimated that earth’s average temp with increase by 2 degrees in the next 100 years.

Ocean AcidificationCO2 dissolve rate increases with increasing temperature

carbon dioxide (CO2) reacts with bicarbonate (H2CO3) to produce carbonic acid (HCO−) and carbonate (CO2−) and H+

Leads to acidification

Video

HOLE IN THE OZONE LAYER

O3 (ozone) blocks radiation CFCs (chlorofluorocarbons)

from refrigerators and propellants break down ozone

Localized in southern hemisphere and increased in size over time

ACID RAIN Burning of coal produces

H2SO4 (sulfuric acid) and burning of gasoline produces HNO3 (nitric acid)

ACID RAIN These pollutants enter the

atmosphere to form acidic water (acid rain)

Changing pH causes diseases or death in trees, fish, and other organisms.

LAND AND WATER POLLUTION

Bioaccumulation: pollutant from the environment enters the food chain through the lowest level

Biomagnification: increase in concentration of a pollutant moving up the food chain

Video

ECOSYSTEM DESTRUCTION

Extinction Imbalances (i.e. removing keystone

species, habitat destruction)