Answer THREE of the following questions with fully detailed essay responses. Al

Answer THREE of the following questions with fully detailed essay responses. All answers must be cited in APA format using published journal articles, government reports, classroom resources or other reputable, scholarly sources. The completed exam will be approximately 5-6 pages MAX, excluding references. Please stick to the page maximum. Be concise and clear with your information and you should be able to meet that page limit with no problems. An approximate length is suggested for each answer. Longer is not always better. Be succinct, and focus on the main points. Upload a Word document with your answers to the essay questions.
1. In the context of global environmental change, identify a specific threat to either freshwater or marine or terrestrial ecosystems (choose one), and describe a potential approach to either removing or mitigating the threat. For this section, you will need to do some new research to support your discussion. What are the strengths and weaknesses of this approach, and what makes it likely to succeed? Your response to Question 1 should be 1.5-2 pages long.
2. In the context of global environmental change, identify a specific problem either at the interface of the marine and terrestrial environments or at the interface of the freshwater and terrestrial environment (choose one of the two interfaces). Describe a potential approach to either removing or mitigating the problem. For this section, you will need to do some new research to support the discussion. What are the strengths and weaknesses of this approach, and what makes it likely to succeed? Your response to Question 2 should be 1-1.5 pages long.
3. First, describe the major sources of excess environmental nitrogen. Then, answer the following questions separately for (a) terrestrial ecosystems and (b) freshwater ecosystems. Your answer to question 3 should be about 1 page long, to cover each ecosystem.
How does excess nitrogen enter the ecosystem?
What are the major effects on the ecosystem?
4. Explain why average global temperature is increasing. Be sure to name the major chemical compounds that influence heat retention in the atmosphere and state where they come from. Ideally you will provide a diagram with explanation in the text. Your answer to question 4 should be about a page long.