China, the world's biggest emitter of carbon dioxide, produces 12.7 billion metric tons of emissions annually. That dwarfs U.S. emissions, currently about 5.9 billion tons annually.
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Vehicle emissions, fuel oils and natural gas to heat homes, by-products of manufacturing and power generation, particularly coal-fueled power plants, and fumes from chemical production are the primary sources of human-made air pollution.
Finland, known as the country with the cleanest tap water, boasts 168,000 lakes and 647 rivers, out of which a staggering 85% have been deemed to have high-quality water.