jueves, 6 de octubre de 2016

1-Fossil fuels
1.1 Percent of energy used each year in the united states comes from fossil fuels
1.2 Coak,oil and natural gas-are a leading energy source around the world
A-Pros
1.1 When natural gas burns,it produces mostly carbon dioxide and water vapor
1.2 A especial advantage of natural gas is that it burns very cleanly
B-Cons
1.1 Also,fossil fuels(except for natural gas) pruduce pollutants
1.2 Gases released from burning fossil fuels trap more heat in earths atmosphere than would be trapped naturally.
2- Hydroeletric power
1.1 Water is widery used to produce electricity
1.2 The movement of these electrons creates an electric current
A-Pros
1.1 Dams produce a great deal of needed electricity
1.2 Dams also create many opportunities for

B-Cons