1
power from natural resources, that is continually available for human use
2
a long-term change in the Earth's temperatures and weather patterns
3
using as little power as possible
4
the air, water, and land in which people,
animals, and plants live
5
electricity or other force that can be used to make machines, cars, etc., work
6
the act of causing air, water, or land to become dirty and unhealthy for people, animals, and plants
