Passage Summary: Chemical fertilizers are bad for your health and they kill the worms that keep gardens fertile. For these reasons, we should stop using them.

Conclusion: People should avoid using chemical fertilizers.

Reasoning: Chemical fertilizers are health hazards and they destroy earthworms, which are necessary for maintaining fertile soil.

Analysis: To identify the conclusion, look for the author's main point or recommendation. The phrase 'For this reason alone' is a major indicator, pointing directly to the claim that the use of these fertilizers should be avoided. The information about health hazards and earthworm castings serves as the supporting evidence for this central prescriptive claim. Look for an answer that mirrors this specific recommendation rather than just restating the facts about worms or health.