Acid Rain
Air Pollution: The data provides "compelling" evidence that particulates in air pollution may trigger a heart attack.
Noun It is important to breathe freely and combat air pollution.
Climate Change: The President called for urgent action on climate change.
Noun: For the Maldives, climate change is not a distant possibility.
Endangered Species: A species of animal or plant that is at risk of extinction
Noun The bald eagle is no longer an endangered species