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climate change


an average increase in the temperature of Earth’s atmosphere

Many scientists believe that climate change is causing Arctic ice to melt.

  climate change

atmosphere


protective layer of gases that surrounds Earth

Earth’s atmosphere is warmed by heat from the sun.

  atmosphere

greenhouse gases


gases that trap heat in the atmosphere

Burning fossil fuels, like coal, oil, and natural gas, produces greenhouse gases.

  greenhouse gases

fossil fuels


fuels, like coal, oil, and natural gas, formed from animal and plant remains

People burn fossil fuels to make energy in order to power things like homes and cars.

fossil fuels

lairs


snow shelters for newborn seal pups

Mother seals build lairs for their pups beneath snow.

  lairs
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