Carbon dioxide is
a. poisonous and, therefore, a danger in the atmosphere.
b. decreasing because of industrialization and harming coral formations.
c. entering the atmosphere at an increased rate because of industrialization.
d. a cause of acid rain and limited by international laws.
e. now stabilized, and international concern has moved to other environmental gases.
Question 2
The air that encompasses the world is called the ultimate common' because
a. it is not owned by anyone but is used, and abused, by all.
b. it is necessary for the common good of the planet.
c. while its use is regulated by states, the UN has ultimate control over it.
d. unlike the ocean, another common, the quality of this area can affect millions of people.
e. it is the last major area of the earth left pristine.
One danger of a wire fence is that, as shown in this photo, it is practically invisible; a running a
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