Washington DC Standards
DC.6.6. Resources: Broad Concept: Sources of materials differ in amounts, distribution, usefulness, and the time required for their formation. As a basis for understanding this concept, students:
6.6.3. Recognize that the Earth's resources for humans, such as fresh water, air, arable soil, and trees, are finite.
6.6.5. Investigate and describe how pollutants can affect weather and the atmosphere.