Transcript Poisons can get into the environment

Human
Impact
Invasive Species
Non-Native Species
enter an ecosystem
• Invasive Species, Alien Species, NonNative Species are all the same.
• Globalization has allowed species to get
into new ecosystems. Pets and
Hitchhikers.
• Compete with native species and WIN!
• Makes native species endangered or
extinct.
Acid Rain
Deadly Acid Rain
• Chemicals like Sulfates and Nitrates enter
the atmosphere from factory smoke and
car exhaust.
• The pollution mixes with rain in clouds and
lowers the pH of the water.
• The resulting acid rain burns trees,
pollutes rivers and lakes killing fish and
whole ecosystems.
Global Warming
Climate Change via
Green House Gasses Include
• Carbon Dioxide
• Water Vapor
• Methane
Climate Change = Global Warming
•
•
•
•
•
Polar Ice melts, drowning coastal areas.
Average global temperature rises = HOT!
Ecosystems shift north.
Loss of Biodiversity.
Rain patterns shift = New deserts!
How do we stop it?
•
•
•
•
Reduce combustion of fossil fuels.
Drive less cars.
No Coal, Oil, or Natural gas power plants.
Reduce your personal electricity
consumption.
• Recycle manufactured materials.
• Write your congressman, Protest!
Ozone Layer Hole
CFC eat the Ozone Layer
• The ozone layer protects us from cancer
causing UV rays.
• Chloro-floro-hydrocarbons are released
from refrigerants (refrigerators, car ACs,
home Acs, and arosol cans)
• Laws banning CFCs in the 1990s has
helped to restore some of the ozone hole.
Deforestation
Deforestation is poor land use.
• Cut trees down for lumber, agriculture, and
human settlements.
• Destroys habitat for organisms, creates
extinct species.
• Removes CO2 absorbing trees that stop
global warming.
• No plants to hold soil = soil erosion.
Bioaccumulation
or
Biomagnification
Poisons get into the environment
• Toxins - harmful chemicals that my get passed
from one energy level to the next as they move
up the food chain, DDT, lead, mercury
• Pesticide - a chemical used to kill agricultural
pests, mainly insects
Causes
• Bioaccumulation (Biomagnification) - increasing
concentration of a harmful substance in
organisms at higher trophic levels in a food
chain or food web
Bioaccumulation (Biomagnification)
30
30
30
30
30
30
30
30
30
30
30
900
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
trophic level
producers
primary
consumers
secondary
consumers
tertiary
consumers
top carnivore
organism
phytoplankton
zooplankton
small fish
large fish
raptor
total organisms
caught
20
___ ÷ ___ = ___
___ ÷ ___ = ___
___ ÷ ___ = ___
Total pollutants
in caught by
the organism
pollution
average math
____ ÷ 20 = 2
average
amount of
pollution in the
population
2
____ ÷ 5 = ____