Title: KEY CONCEPT As the human population grows, the demand for Earth
1KEY CONCEPT As the human population grows, the
demand for Earths resources increases.
2Objectives
- Summarize the current state and effects of human
population growth - Explain the importance of effective resource
management
3Vocabulary
- Nonrenewable resource
- Renewable resource
- Ecological footprint
4Earths human population continues to grow.
- Earths human carrying capacity is unknown.
5- Technology has helped to increase Earths
carrying capacity.
- gas-powered farm equipment
- medical advancements
6The growing human population exerts pressure on
Earths natural resources.
- Nonrenewable resources are used faster than they
form. - coal
- oil
7- Renewable resources cannot be used up or can
replenish themselves over time.
- Growing use of nonrenewable resources may lead to
a crisis. - Resources must be properly managed.
8- An ecological footprint is the amount of land
needed to support a person.
- The land must produce and maintain enough
- food and water
- shelter
- energy
- waste
9- Several factors affect the size of the ecological
footprint.
- amount and efficiency of resource use
- amount and toxicity of waste produced
10Give 3 examples of how technology has influenced
human population growth
11What is the difference between renewable and
nonrenewable resources
12What factors can limit the growth of the human
population?
1316.2 Air Quality
KEY CONCEPT Fossil fuel emissions affect the
biosphere.
14Objective
16.2 Air Quality
- Describe the sources, types, and effects of
pollution - Explain how air pollution contributes to acid rain
15Vocabulary
- Pollution
- Smog
- Particulate
- Acid rain
- Greenhouse effect
- Global warming
16Pollutants accumulate in the air.
16.2 Air Quality
- Pollution is any undesirable factor added to the
air, water, or soil. - Smog is one type of air pollution.
- sunlight interacts with pollutants in the air
- pollutants produced by fossil fuel emissions
- made of particulates and ground-level ozone
1716.2 Air Quality
- Smog can be harmful to human health.
- Acid rain is caused by fossil fuel emissions.
- produced when pollutants in the water cycle cause
rain pH to drop - can lower the pH of a lake or stream
- can harm trees
18Air pollution is changing Earths biosphere.
16.2 Air Quality
- The levels of atmospheric carbon dioxide rise and
fall over time. - High levels of carbon dioxide are typical of
Earths warmer periods.
1916.2 Air Quality
- The greenhouse effect slows the release of energy
from Earths atmosphere.
- sunlight penetrates Earths atmosphere
- energy is absorbed and reradiated as heat
- greenhouse gases absorb longer wavelengths
- Greenhousegas moleculesrereleaseinfraredradiat
ion
2016.2 Air Quality
- Global warming refers to the trend of increasing
global temperatures.
North Pole
21Name and describe 2 ways in which pollution
affects ecosystems
16.2 Air Quality
22How does the greenhouse effect keep Earth warm?
16.2 Air Quality
23Explain how a build-up of CO2 in the atmosphere
could increase Earths global temperature.
16.2 Air Quality
24Greenhouse gasses are found close to earths
surface and high above in the atmosphere. Name 2
important functions of greenhouse gasses at
Earths surface.
16.2 Air Quality
25Ocean producers such as phytoplankton are an
important part of food webs, but they require a
specific temperature range to survive. How might
increased water temperature affect these ocean
food webs?
16.2 Air Quality
2616.3 Water Quality
KEY CONCEPT Pollution of Earths freshwater
supply threatens habitat and health.
27Objectives
16.3 Water Quality
- Describe how water pollution affects ecosystems
- Explain how biomagnification causes accumulation
of toxins in food chains
28Vocabulary
16.3 Water Quality
- Indicator species
- biomagnification
29Biomagnification causes accumulation of toxins in
the food chain.
16.3 Water Quality
- Pollutants can move up the food chain.
- predators eat contaminated prey
- pollution accumulates at each stage of the food
chain
- Top consumers, including humans, are most
affected.
302 Types of Pollutants that undergo
Biomagnification are PCBs and DDT
16.3 Water Quality
- Polychlorinated biphenyls (PCBs) were widely used
as coolant fluids - PCBs can negatively impact growth and development
within the egg, causing - Genetic mutations
- Deformities
- Death
31DDT was made available for use as an agricultural
insecticide after WWII
16.3 Water Quality
- In 1962, Silent Spring by American biologist
Rachel Carson was published. - The book suggested that DDT and other pesticides
may cause cancer and that their agricultural use
was a threat to wildlife, particularly birds. - Its publication was one of the signature events
in the birth of the environmental movement, and
resulted in a large public outcry that eventually
led to DDT being banned for agricultural use in
the US in 1972. - The US ban on DDT is cited by scientists as a
major factor in the comeback of the bald eagle,
and the peregrine falcon from near-extinction in
the contiguous US
32How do PCBs affect bird populations through
biomagnification?
16.3 Water Quality
33Would a buffalo or a mountain lion be more
affected by biomagnification? Why?
16.3 Water Quality
34How does the biomagnification pyramid compare
with the energy pyramid?
16.3 Water Quality
3516.4 Threats to biodiversity
KEY CONCEPT The impact of a growing human
population threatens biodiversity.
36Objectives
16.4 Threats to biodiversity
- Assess the consequences of loss of biodiversity
- Explain how loss of habitat and introduced
species affect ecosystems and biodiversity
37Vocabulary
16.4 Threats to biodiversity
- Habitat fragmentation
- Introduced species
38Preserving biodiversity is important to the
future of the biosphere.
16.4 Threats to biodiversity
- The loss of biodiversity has long-term effects.
- loss of medical and technological advances
- extinction of species
- loss of ecosystem stability
39Loss of habitat eliminates species.
16.4 Threats to biodiversity
- Habitat fragmentation prevents an organism from
accessing its entire home range. - occurs when a barrier forms within the habitat
- often caused by human development
40- Habitat corridors are a solution to the problem.
- corridors can be road overpasses or underpasses
- allow species to move between different areas of
habitat
41Introduced species can disrupt stable
relationships in an ecosystem.
16.4 Threats to biodiversity
- An introduced species is one that is brought to
an ecosystem by humans. - accidental
- purposeful
- Invasive speciescan have anenvironmentaland
economicimpact.
42Invasive species often push out native species.
16.4 Threats to biodiversity
- kudzu (southeastern United States)
- Burmese python (Florida Everglades) mice
(Australia)
43List reasons that biodiversity is important to
humans
16.4 Threats to biodiversity
44How does habitat fragmentation affect migrating
bird populations?
16.4 Threats to biodiversity
45What types of damage can introduced species cause?
16.4 Threats to biodiversity
46How could continued fragmentation reduce
biodiversity?
16.4 Threats to biodiversity