A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first line because it introduces the main topic of climate change and its effects. It gives a broad overview of the issue without needing prior context. It sets the stage for the discussion that follows. Why other lines are not chosen? Paragraph 2 starts with "The government has promised" which needs context. Paragraph 3 starts with "And with the second largest tidal range" which is not a general statement. Paragraph 4 starts with "But harnessing the power" which is a continuation. Paragraph 5 starts with "In 2013" which is a specific time reference and does not introduce the main topic.

Concluding sentence: Why this is the last line? This paragraph is the last line because it wraps up the discussion by providing a specific example of the consequences of climate change and energy plans. It summarizes the earlier points about the risks involved.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): This pair connects because the second paragraph explains the government's response to the climate change mentioned in the first paragraph. It shows a logical order from the problem to the solution.
• Pair 2 (Paragraph 2 → Paragraph 3): This pair connects because the third paragraph gives an example of how the government can use marine energy to help with the climate change issue. It follows a broader to specific strategy.
• Pair 3 (Paragraph 3 → Paragraph 4): This pair connects because the fourth paragraph shows a contrast to the positive view of marine energy in the third paragraph. It uses a contrast strategy to show that there are risks involved.
• Pair 4 (Paragraph 4 → Paragraph 5): This pair connects because the fifth paragraph provides a specific example of the consequences mentioned in the fourth paragraph. It follows a logical order from a general statement to a specific case.