Some environmental disasters are avoidable. (True or false?)

Some environmental disasters are avoidable. Indicate whether the statement is true or false.

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Q. 2 - The population density of the Earth has tripled since World War II. Indicate whether the statement is true or false.

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Q. 3 - Since 1950, about one-third of all U.S. croplands have been lost due to erosion. Indicate whether the statement is true or false.

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Q. 4 - The size of our population is limited by the amount of food we can grow. Indicate whether the statement is true or false.

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Q. 5 -

Nations that tend to have the greatest environmental impacts are those with the lowest population
  growth rates. Indicate whether the statement is true or false.

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Q. 6 - The highest soil degradation rates occur in Africa. Indicate whether the statement is true or false.