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Hydraulic fracturing can contaminate groundwater.

Which natural hazard is caused by sudden movement along faults?

Which heavy metal is the most widespread toxic contaminant in North America?

At least 1 billion people live in crowded, unsanitary slums worldwide

What is food security?

The Montreal Protocol was designed to phase out substances that deplete the ozone layer, such as CFCs.

Which disease caused the greatest loss of life in a single year during the 20th century?

Which two factors primarily determine the type of biome in an area?

Which biome occurs where rainfall exceeds 200 cm per year and temperatures are warm year-round?

Which greenhouse gas has increased by about 151% since pre-industrial times?