1. You should use green sources of energy because you can protect the earth.
2. We should limit the use of fossil fuels or our future generations will lack energy.
3. Although green sources of energy are good, we need more time to make them perfect.
Green sources of energy are good but we need more time to make them perfect.
4. VietNam has a long seaside so it is suitable to develop solar energy and wind power.
Because Viet Nam has a long seaside, it is suitable to develop solar energy and win power.