Need science help with (4) questions 100-200 Word answers

Using the textbooks or other resources, answer EACH of the following questions in 100 to 200 words.

What would you include in a brief summary on the history of the modern environmental movement, from the 1960s to the present?
Explain the primary concern over exponential population growth. What promotes exponential population growth? What constrains exponential population growth?
What is carrying capacity? Compare predictions for human population growth in developed countries versus developing countries. What will occur if carrying capacity is exceeded?
How do individual choices affect natural ecosystem? Provide examples from your personal or community experience.