1. Which is an example of a renewable resource? 1. Copper
2. Coal
3. Phosphorus
4. Water

2. How does deforestation contribute to global warming?
1. It decreases the amount of carbon dioxide in the atmosphere.
2. It increases the amount of carbon dioxide in the atmosphere.
3. It decrease the amount of oxygen in the atmosphere.
4. It increase the amount of oxygen in the atmosphere.

3. Which practice limits the effects of a human activity on the environment?
1. Harvesting all the oak trees in a forest.
2. Sending used aluminum cans to a landfill.
3. Using wind turbines to generate electric power.
4. Allowing nutrients from fertilizer to enter a river.

4. Which statement best describes conservation efforts?
1. Methods of conserving resources have both costs and benefits.
2. Methods of conserving resources all have the same costs and benefits
3. The benefits of conserving resources always outweigh the costs
4. Many methods of conserving resources have only benefits