Page 67 - Science Course 3 (Book 1)

Mo2-L3a: How Do Humans Affect Ecosystems?

Global Greenhouse Gas Emissions by Economic Sector Key Concept
25% Electricity and Heat Production
How Do Humans Affect Ecosystems?
24% Agriculture, Forestry, and Other Land use
How can people protect ecosystems and conserve
6% Buildings resources?
14% Transportation
21% Industry

10% Other Energy

Protecting the World
Scientists are working to develop renewable energy
resources that can reduce pollution and people’s
dependence on fossil fuels.

The U.S. government passes laws,
enforced by the U.S. Environmental
Protection Agency (EPA), to help SUMMARY
protect the environment.
How Do Humans Affect Ecosystems?
The EPA also monitors environmental Organisms affect their environment in both
health, looks for ways to reduce human impacts, positive and negative ways.
develops plans for cleaning up polluted areas, and
supports environmental research at universities and Making and enforcing environmental laws
national laboratories. can protect the environment from further
damage.

RETHINK RESTORE

More industries and people are turning to
renewable resources rather than using
nonrenewable resources.

The 5Rs—restore, rethink, reduce, reuse, and recycle
—are actions everyone can take to help keep the
environment healthy and to make sure that future
generations of life on Earth have the resources they
need to survive.

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