Acid Rain: Rain, snow or sleet containing harmful chemicals
Air Pollution: Contamination of the air by smoke and gases:
Noun: The most serious Air Pollution comes from the burning of fossil fuels.
Climate Change: Long-term changes in Earth´s climate, such as rising temperatures and lower rainfall
Noun: Climate Change is affecting every country on every continent.
Endangered Species: A species of animal or plant that is at risk of extinction
Noun: The bald eagle is no longer an Endangered Species