What problem does the central idea "Deforestation by lumber interests and toxic-waste dumping are major environmental problems in the United States today" present?

The central idea emphasizes that deforestation and toxic-waste dumping are both significant environmental issues, which indicates that it presents more than one distinct concept. This dual focus can dilute the impact of the message, as it addresses two separate yet important problems that require different solutions and considerations.

When a central idea encompasses multiple topics, it may lead to a lack of clarity in communication and can be challenging to develop fully in a discussion or argument. By concentrating on a single issue, the writer or speaker can provide a more thorough analysis, exploration of causes and effects, and potential solutions. Thus, identifying that the central idea contains more than one idea demonstrates a thoughtful understanding of effective communication and argumentation in environmental discourse.