Why are scientists concerned about the greenhouse effect? I. No technology will keep the temperature of the Earth constant. II. Earth has many desert areas. Planting trees in wider areas is impossible. III. Human activities like the burning of fossil fuels and deforestation increase the greenhouse effect. IV. The human population is increasing at a rapid rate; more CO2 will be released into the atmosphere due to human activities. A. II only B. IV only C. I, III D. II, IV

Why are scientists concerned about the greenhouse effect? I. No tech

1.	Why are scientists concerned about the greenhouse effect? I. No technology will keep the temperature of the Earth constant. II. Earth has many desert areas. Planting trees in wider areas is impossible. III. Human activities like the burning of fossil fuels and deforestation increase the greenhouse effect. IV. The human population is increasing at a rapid rate; more CO2 will be released into the atmosphere due to human activities. A. II only B. IV only C. I, III D. II, IV
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