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d. Carbon dioxide

e. Methane

13. Deforestation can cause global warming because forests function . . .

a. Holding the sun's rays to bounce back into space
b. Causes the air to feel cool because it releases oxygen
c. Provides protection against the soil from being exposed to the sun

d. Absorb oxygen gas to carry out photosynthesis

e. Absorb carbon dioxide gas which is a greenhouse gas

14. What is meant by the greenhouse effect is . . .
a. Increased ambient temperature due to the large number of glass-

walled buildings in large, densely populated cities
b. The inhibition of sunlight that will enter the earth because it is

blocked by greenhouse gases

c. Increased greenhouse gases that can generate heat because of
their nature that absorbs solar heat

d. The occurrence of reflection of sunlight by the glass in the
skyscraper is absorbed by the ground surface

e. The trapping of energy from sunlight in the atmosphere because
the reflected light from the earth into space is blocked by

greenhouse gases

15. Green chemistry movement is motivated by. . .

a. Threats to the preservation of the earth due to pollution caused by
natural disasters

b. There are many chemical products that are not useful for humans
and waste natural resources

c. The increasing pressure from environmentalists to carry out a
movement to save the earth

d. The melting of the polar ice caps due to increasing global warming