5. Landfill waste, _______ overtime, can have a negative impact on the environment.
A. is gathered B. gathering C. gathered D. gather
6. The leaflets _______ by environmental organisations aim to raise awareness of the dangers of deforestation.
A. distribute B. distributed C. distributing D. are distributed
7.We need a global system for limiting _______ emissions.
A. power plant B. heat-trapping gases C. greenhouse gas D. global warming
8. _______ has been shown to cause floods and drought.
A. Chemist B. Power C. Deforestation D. Solution
9. The city produces 20 million tons of household _______ each year.
A. pollution B. waste C. globalization D. activity
10. Carbon dioxide is produced in huge amounts when_______ are burned.
A. greenhouse gas B. deforestation C. power plant D. fossil fuels
11. Our research measures the impact of_______ on this particular eco-system.
A. human activity B. sea level C. greenhouse gas D. global warming