1. Greenhouse gases are those gases in the atmosphere that have an influence on the earth's energy balance. 

2.Global climate change has already had observable effects on the environment. 

3.The flowers give off a fragrant perfume.

4. Infectious diseases are disorders caused by organisms .

5.Youths always absorb new ideas

6.Transport of ionizing radiation in terrestrial-like exoplanet atmospheres.

7.She was banned from driving for two years.

8.Rebel forces captured the city after a week-long battle.

9.A catastrophic storm made landfall on US soil.

10.She cleans up her car.

11.The destruction of the rainforests is contributing to global warming.

12.The wonderful diversity of our region's wildlife is now coming under threat.

13.The destruction of the rain forests is an ecological disaster.

14.Environmental awareness has increased dramatically over the past decade.