Which of the following is a complex problem faced by the global economy?

a. decreasing cost of the solar energy

b. increasing human population

c. increasing standard of living

d. decreasing greenhouse gas emissions

apex environmental science

The answer is; B

Increasing human population put enormous pressure on natural resources of the planet. This is because increasing human population is directly proportional to increasing energy demands and food. Therefore meeting these needs become more and more  difficult and requires innovations. Space also becomes inadequate.

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cell division is not regulated in tumor cells.