Download Human Impact

Human Impact
Human Population
Pollution
• Harmful materials entering the environment
• Point source pollution – from a clearly
identifiable source
• Nonpoint pollution comes from many
different sources.
• Four main categories – industrial, residential,
commercial, and environmental
PART 2 – PROBLEMS
Problems resulting from human impacts on the quality of our
environment
A. Aquatic Environment Issues –Water pollution, Ocean Dead
Zones, Water Diversion, Overfishing (2015)
B. Air Quality Issues – Acid rain, Air Pollution, Nuclear Pollution
(2015)
C. Climate Change Issues – Greenhouse Effect, Ozone Depletion
(2015)
D. Terrestrial Environment Issues – Desertification,
Deforestation, Soil pollution, Waste Disposal, Mining (2016)
E. Population Growth Issues – Habitat Destruction, Farming
Practices, Fertilizers & Pesticides (2016)
Sources of pollution
• organic pollution – decomposition of living
organisms and their bi-products
• inorganic pollution – dissolved and suspended
solids as silt, salts, and minerals
• toxic pollution – heavy medals and other chemical
compounds that are lethal to organisms
• thermal pollution – waste heat from industrial and
power generation processes
• radiation pollution - radioactive materials
Environmental Pollution
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Air Pollution
Water Pollution
Soil Pollution
Noise Pollution
Radioactive Pollution
Thermal Pollution
Light Pollution
Aquatic Environmental Issues
(2015)
• Water pollution
• Eutrophication
• Ocean Dead Zones
• Thermal Pollution
• Water Diversion
• Overfishing
Water Pollution
Eutrophication
Eutrophication – bodies of water becomes enriched with nutrients. This can be a
problem in marine habitats such as lakes as it can cause algal blooms.
• run-off from fertilizers, into nearby water causing an increase in nutrient
levels.
• It causes phytoplankton to grow and reproduce more rapidly, resulting in
algal blooms.
• This bloom of algae disrupts normal ecosystem functioning and causes many
problems.
• The algae may use up all the oxygen in the water, leaving none for other
marine life. This results in the death of many aquatic organisms such as fish,
which need the oxygen in the water to live.
• The bloom of algae may also block sunlight from photosynthetic marine plants
under the water surface.
• Some algae even produce toxins that are harmful to higher forms of life. This
can cause problems along the food chain and affect any animal that feeds on
them.
Ocean Dead Zones
Eutrophication is magnified as rivers lead into larger rivers and eventually into
the ocean – as the Mississippi River network. This leads to ocean dead zones.
Spills or Dumping in Oceans
Chemical spills and
dumping of waste in
the oceans or near
coral reefs and
ocean shelf areas
causes major
environmental
problems.
BP Oil Rig Explosion 2010
Thermal Pollution &
Rising Ocean Temperatures
• Change in the water
temperatures of lakes,
rivers, and oceans
caused by made-man
industries or practices
• Water as coolant is
warmed returned & to
body of water
• Ocean warming from
climate changes
Coral
Bleaching
Water Diversion
Dams are a major factor in
water diversion. Dams are
built along rivers to
produce reservoirs.
This affects the ecology of
the river and the
surrounding environment
including Habitat Loss,
Habitat Fragmentation,
and Loss of Biodiversity
The Colorado River is a
good example.
Overfishing
Fish catch has risen from 20 million tons/year
to over 90 million tons / year
World Fish Catch
Air Quality Issues – 2015
•Acid rain
•Air Pollution
•Nuclear Pollution
Acid Rain
Air Pollution
Nuclear Pollution
• Nuclear pollution is
pollution that is
radioactive.
• Fallout can lead to
radiation sickness and
death.
• Nuclear fallout can
destroy environmental
features and animal life.
Fukushima Daiichi
Disaster -2011
Climate Change Issues
• Greenhouse Effect - warming that results
when the atmosphere traps heat radiating
from Earth toward space.
• Ozone Depletion - ozone layer is
deteriorating due to the release of pollution
containing the chemicals chlorine and
bromine (chlorofluorocarbons or CFCs)
Greenhouse Effect
Ozone Depletion
Ozone Hole over Antartica
Source: NASA
Terrestrial Issues- 2016
• Desertification
• Deforestation
• Soil pollution
• Waste Disposal
• Mining
Desertification
• Desertification is an expansion of arid
conditions into a non-arid environment.
• Major causes of desertification include
Overgrazing & poor grazing management
Cultivation of marginal lands
Destruction of vegetation in arid regions
Incorrect irrigation practices leading to
salinization
Deforestation
Deforestation – the permanent destruction of
indigenous forests and woodlands.
Causes include
• Conversion of forests to agricultural land to feed
people
• Development of cash crops and cattle raising esp. in
tropical countries
• Commercial logging that is not regulated
• Poor soils in humid tropics do not support agriculture
for long so more clearing becomes necessary
Soil Pollution
Ways that soil can become polluted, such as:
• Seepage from a landfill
• Discharge of industrial waste into the soil
• Percolation of contaminated water into the soil
• Rupture of underground storage tanks
• Excess application of pesticides, herbicides or fertilizer
• Solid waste seepage
Most common chemicals involved in causing soil pollution are:
• Petroleum hydrocarbons
• Heavy metals
• Pesticides
• Solvents
Waste Disposal
Waste, or rubbish, trash, junk, garbage is an
unwanted or undesired material or substance.
It may consist of the unwanted materials left over
from a manufacturing process (industrial, commercial,
mining or agricultural operations,) or from community
and household activities.
The material may be discarded or accumulated, stored,
or treated (physically, chemically, or biologically),
prior to being discarded or recycled.
Mining - Environmental Risks
Population Growth Issues –2016
• Urbanization
• Habitat Destruction
• Farming Practices
• Fertilizers & Pesticides
Human Population Growth
Urbanization
Concerns:
oPublic Health
oFood Supply
oFreshwater
oCoastlands and Oceans
oForests
oBiodiversity and Habitat Destruction
oGlobal Climate Change
Habitat
Fragmentation
& Destruction
Habitat destruction and fragmentation is a process
that describes the emergences of discontinuities
(fragmentation) or the loss (destruction) of the
environment inhabited by an organism.
It results in
1. Loss of resident species
2. Loss of food sources
3. Loss of ecosystem functions provided by the
habitat
Biodiversity
Threats
• Habitat loss &
Fragmentation
• Invasive species
• Pollution
• Climate Change
• Over exploitation
• Human Populations
Farming Practices
Negative environmental impacts from
unsustainable farming practices include:
Land conversion & habitat loss
Wasteful water consumption
Soil erosion and degradation
Pollution
Climate change
Genetic erosion
Fertilizers and Pesticides
Part 3 – Solutions
A. Environmental Remediation Strategies
B. Sustainability Strategies
C. Nonrenewable vs. Renewable Energy
Sources and Alternate Energy Sources
D. Everyday Solutions as recycling and
composting
E. Legislation and Economic Opportunity for
Solving Problems
Tragedy of the Commons
• Conflict between individual interest and the
common good
• When individuals use a public good, they do
not bear the entire cost of their actions
• Who takes responsibility for protecting the
environment?
Environmental Remediation
Strategies
• Environmental remediation is the removal of pollution or
contaminants from the environment
• Strategies and techniques include (coordinated by EPA)
Site assessment and mapping
Excavation and dredging
Pump and treat
Solidification and stabilization
Oxidation
Soil vapor extraction
Bioremediation – using microbes to remove pollutants
Sustainability Strategies
Sustainability - biological systems enduring
and remaining diverse and productive
Strategies include
Minimize energy consumption & using
alternate energy
Minimize water consumption
Minimize negative environmental impacts
Minimize waste generation and recycling
Develop eco-friendly products and processes
Strategies for a Sustainable World
• advancing technologies to reduce waste
• increasing recycling and reuse
• creating even safer treatment and disposal
options
• developing sources of renewable energy
• sharing the benefits of our learning and
innovation
Nonrenewable vs. Renewable
Energy Sources
• Non-renewable energy sources – fossil fuels
as coal, oil and natural gas as well as nuclear
fuels – limited supply will run out and have
negative environmental impacts
• Renewable energy sources – sun, wind,
waves, heat, hydropower and biomass that
can be used again and again and is cleanest
energy sources.
• There are pros and cons for each type of
energy
Alternate Energy Sources
Alternate to Fossil Fuels – produced and
recovered without negative effects on the
environment as
• Solar
• Wind power
• Geothermal
• Tides and waves
• Biomass
• Fuel cells
Everyday Solutions
• Conserve
• Increase Efficiency
• Recycle
Composting
Benefits of Composting
• Soil Conditioner – create rich humus
• Recycles kitchen and yard waste
• Introduces beneficial organisms in the soil
• Good for the environment as a natural
alternative to chemical fertilizers
• Reduces landfill waste
Economic Opportunity
• Support careers in Environmental
Remediation
• Development of Environmentally Safe
Products and Processes which are
economically sound.
• Encourage Economic Growth that is
environmentally beneficial