Step 1: Understanding the Concept:
This question refers to a detail from the prose piece 'Me and the Ecology Bit', where the narrator tries to persuade his neighbors to adopt eco-friendly habits.
Step 2: Detailed Explanation:
The narrator, Jim, sees his neighbor, Mr. Johnson, preparing to drive his car. He advises Mr. Johnson to walk instead.
To strengthen his argument, Jim points out that Mr. Johnson's destination, the post office, is extremely close to his house. The text specifies this distance as just two blocks.
The short distance highlights the narrator's point that using a car for such a small trip is wasteful and bad for the environment.
Step 3: Final Answer:
The post office was two blocks away from Mr. Johnson's house.