1.these types of energy do not cause pollution or waste ( nature)           resources

2.we want to buy (produce)                  that will save money

3.this new plant is being built to provide (electric)                     for the population of the local area

4.scientists are looking for clean and ( effect)              sources of energy

5.we hope that by using solar energy, the problem of energy (short)                           will be solved

6.(Fortunate)                               , burning fossil fuels produces lots of greenhouse gases which causes global warming