1. p618

2. Figure 19.1 The Greenhouse Effect
The normal greenhouse effect warms Earth to a hospitable temperature. An increase in greenhouse gases intensifies the
greenhouse effect, trapping more heat and raising Earth’s temperature.
Figure 19-1 p621

3. Air pollution endangers
the well-being
of more than half of
Americans, including
many city dwellers.
p623

4. Renewable energy
sources, such as
wind, can provide
more environmentally
friendly alternatives.
However, individual
choices and behaviors
also have an impact on
the state of our world.
p624

5. p625

6. Portable metal containers
are a “greener”
alternative to disposable
plastic water
bottles.
p626

7. Secondhand smoke
puts everyone,
including babies,
at risk of serious
health problems.
p627

8. Read the labels on
common cleaning
products and follow
instructions for use
and storage to avoid
possible health risks.
p629

9. Figure 19.2 Greening Your Space
Figure 19-2 p631

10. Pesticides protect
crops from harmful
insects, plants, and
fungi but may endanger
human health.
p633

11. Although laboratory
studies on animals
indicate that EMFs
affect human cell
membranes, research
on humans has found
only a weak connection
between EMFs
and disease.
p634

12. Besides listening to
the music at your next
concert, tune into the
noise level and how
your ears are feeling.
p636

13. Figure 19.3 Louder and Louder
The human ear perceives a 10-decibel increase as a doubling of loudness.
Thus, the 100 decibels of a subway train sound much more than twice as
loud as the 50 decibels of a rushing stream.
Figure 19-3a p637

14. Figure 19.3 Louder and Louder
The human ear perceives a 10-decibel increase as a doubling of loudness.
Thus, the 100 decibels of a subway train sound much more than twice as
loud as the 50 decibels of a rushing stream.
Figure 19-3b p637