Introduction to Environmental Science

Events this year

This lecture will help you understand:The meaning of the term environmentThe importance of natural resourcesThat environmental science is interdisciplinary Some pressures facing the global environmentSustainability and sustainable development

Environment: the total of our surroundings• All the things around us with which we

interact:• Living things

• Animals, plants, forests, fungi, etc.• Nonliving things

• Continents, oceans, clouds, soil, rocks• Our built environment

• Buildings, human-created living centers• Social relationships and institutions

What Is Environmental Science?Environmental Science is the study of how humans interact with their environment

Our environment is everything that surrounds us, both natural and man-made.

Environmental science: how does the natural world work?

Environment impacts Humans

• It has an applied goal: developing solutions to environmental problems

An interdisciplinary fieldNatural sciences: information about the world

Environmental Science programsSocial sciences: values and human behavior

Environmental Studies programs

ResourcesWhat is the difference between a renewable and a non-renewable resource?

With your partner come up with a list of 5 ways that human’s are interacting with the environment in sustainable and non-sustainable ways

Natural resources: vital to human survival

Renewable resources:Perpetually available: sunlight, wind, wave energyRenew themselves over short periods: timber, water, soil

These can be destroyedNonrenewable resources: can be depleted

Oil, coal, minerals

Natural resources = substances and energy sources needed for survival

Environmental science… can help us avoid mistakes made by past civilizations.

The lesson of Easter Island: people annihilated their culture by destroying their environment. Can we act more wisely to conserve our resources?

Environmental science is not environmentalism

•Environmental science• The pursuit of knowledge about

the natural world• Scientists try to remain objective

•Environmentalism• A social movement dedicated to

protecting the natural world

Population & consumption

Human population growth exacerbates all environmental problems

The growth rate has slowed…but we still add more than 200,000 people to the planet each day

Our consumption of resources has risen even faster than our population growth.

Life has become more pleasant for us so far However, rising consumption amplifies the demands we make on our environment.

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How Fast does population double?

D= 70/G D (time, years) example 3 years!G (growth rate) example 2 % annual growth rate

ANSWER THESE QUESTIONS BELOW!1. HOW long will it take a population with a 10% annual

growth rate to double?2. How long will it take a population with a 1% growth rate to

double?

Garrett Hardin’s Tragedy of the Commons•Unregulated exploitation leads to resource depletion

• Soil, air, water•Resource users are tempted to increase use until the resource is gone•Solution?

• Private ownership?• Voluntary organization to enforce responsible

use?• Governmental regulations?

A World Apart

Yes! You need this!

Environmentally Sustainable Development economic growth has

allowed us to • Live longer• be healthier• have more comfort

It has not allowed us to• stop environmental

problems• Wipe out poverty

Ethics…

Discuss1. Are most Humans Ethical to the environment?

2. Are there benefits to industrialization?

3. Is it better to have people live longer even though we must pollute more to sustain life?

More Money, More Consumers

The countries which have more wealth also use more of the Earth’s resources. We also produce more of the substances which may damage the Earth

Fig. 1-3 p. 5Fig. 1-3 p. 5

The “ecological footprint”The environmental impact of a person or population

Amount of biologically productive land + water

for raw materials and to dispose/recycle waste

Overshoot: humans have surpassed the Earth’s capacity We are using 30% more of the planet’s resources than are available on a sustainable basis!

Ecological footprints are not all equal

The ecological footprints of countries vary greatly

The U.S. footprint is almost 5 times greater than the world’s averageDeveloping countries have much smaller footprints than developed countries

Population Question?Should individuals be allowed to have children? If so…how many?

Should offspring be taxed?

We face challenges in agriculture• -Expanded food production led to increased

population and consumption• -It’s one of humanity’s greatest achievements,

but at an enormous environmental cost• Nearly half of the planet’s land surface is used for

agriculture• Chemical fertilizers • Pesticides • Erosion• Changed natural systems

We face challenges in pollution• Waste products and artificial chemicals used in

farms, industries, and households

Each year, millions of people die from pollution

We face challenges in climate• Scientists have firmly concluded that humans are changing the composition of the atmosphere• The Earth’s surface is warming

• Melting glaciers• Rising sea levels• Impacted wildlife and crops• Increasingly destructive weather

Since the Industrial Revolution, atmospheric carbon dioxide concentrations have risen by 37%, to the highest level in 650,000 years

We face challenges in biodiversity• Human actions have driven many species extinct, and

biodiversity is declining dramatically

Biodiversity loss may be our biggest environmental problem; once a species is extinct, it is gone forever

Sustainable solutions existWe must develop solutions that protect both our quality of life and the environment

Organic agriculture

TechnologyReduces pollution

BiodiversityProtect species

Waste disposalRecycling

Alternative fuels

Sustainability: a goal for the futureHow can humans live within the planet’s means?

Humans cannot exist without functioning natural systems

Sustainability Leaves future generations with a rich and full EarthConserves the Earth’s natural resourcesMaintains fully functioning ecological systems

Sustainable development: the use of resources to satisfy current needs without compromising future availability of resources

Will we develop in a sustainable way?The triple bottom line: sustainable solutions that meet

Environmental goalsEconomic goalsSocial goals

Requires that humans apply knowledge from the sciences to

Limit environmental impacts Maintain functioning ecological systems

Precautionary principle:1. What is the

precautionary principle and why is it hard to implement?

Conclusion

Environmental science helps us understand our relationship with the environment and informs our attempts to solve and prevent problems.

Identifying a problem is the first step in solving it

Solving environmental problems can move us towards health, longevity, peace and prosperity

Environmental science can help us find balanced solutions to environmental problems

Early Environmentalists

President Theodore Roosevelt and naturalist John Muir were two of the first environmental activists.

T. Roosevelt established the National Park System and the system of wildlife refuges found across the country.

However much of the preservation system was based upon utilitarian conservation-the preserving of resources so they can provide homes and jobs for people.

Early EnvironmentalistsJohn Muir was a geologist, author and founder of the Sierra Club. Muir argued that nature deserved to exist for its own sake, regardless of its usefulness to us.

His view was called altruistic preservation-emphasizing the fundamental right of other organisms to exist and to purse their own interests.

Natural ResourcesMuir and Roosevelt both saw the need to preserve natural resources

We must always be careful not to deplete renewable resources faster than they can be replaced, and to recycle and conserve nonrenewable resources.

Natural resources may be renewable such as solar energy and trees

Natural resources may be non-renewable such as oil, natural gas or metals

A Century of “Growth”The inventions of the twentieth century had a remarkable effect on daily life. They also had a devastating effect on the environment. Human population reached 6,000,000,000 in 1999 and continues to grow.

In 1962 Rachel Carson wrote a ground-breaking book on what was happening to the environment. Her book was called “Silent Spring”. It became a warning to change our ways.

“Silent Spring”The title of Carson’s book referred to the disappearance of songbirds due to the pollution of air and water.

People were shocked by the severity of the problem. Carson’s book highlighted the effects of air and water pollution on humans and other species of animals.

The Growth of EnvironmentalismIn 1970, the first Earth Day was celebrated to honor the Earth and shine a light on the damage being done to her.

Thousands of people turned out across the country for rallies and demonstrations to bring attention, both political and popular to environmental problems. Later that same year, 1970, the first Clean Air Act was voted into law which made factories legally responsible for cleaning up what gases are produced through their smokestacks.

Scale of Environmental ProblemsEnvironmental problems are typically categorized by the affected population.

Global problems, like global warming and the hole in the ozone layer affect the entire world population.

It is important to note that even though the entire planet’s population is affected, the problems are caused by people living in the world’s richest countries.

Social

Economic

Environmental

Social Economic

Sustainable

Solutions

Environmental

The Good News

With all that said however, it is important to note that the wealthiest countries have done much to address the world’s environmental problems. The U.S. for example has much better air and water quality than it’s poorer neighbor, Mexico.

Typically these “poorer” countries have few environmental protection laws and many of the same problems.

Gaia Hypothesis Is the Earth Living?True or untrue?Debate time!

Decide if you think the earth is living or not and come up with 5 pieces of evidence to support your belief.

http://www.gaiatheory.org/synopsis.htm

What difficulties do we face when solving environmental problems

Come up with a list of 5 problems we face!

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Social Economic

Sustainable

Solutions

Environmental