A speech claims that because solid waste is overcoming our city streets, we need to consider recycling. Which pattern of speech organization is being used?

problem/solution pattern

Explanation:

This problem/solution pattern of speech is a pattern that introduces the problem first in the speech and then proffers solution to the mentioned problem or issue. In the speech as stated in the question, the speaker first identifies "solid waste overcoming the city" as the main problem, before offering the solution of recycling, hence the pattern of speech organization used here is problem/solution pattern.