Vivi has started hanging out with a new group of friends at school. She is also, though, feeling anxious because her new group of friends skips class often and she is encouraged to skip class as well. Even though Vivi knows her parents will be disappointed if they find out, she skips Friday to go to the beach. What best explains her anxiety?

Based on the graph, how is coal consumption likely to affect future generations? a. the higher our current rate of consumption, the less coal will be available in the future. b. current rates of consumption are irrelevant because new coal will form in the future. c. the lower our current rate of consumption, the more slowly coal will be replenished for the future. d. regardless of current rates of consumption, coal will always be available.