For a long time, scientists used the words global warming to describe the changes taking place in the world. Over the last 200 years, the earth’s temperature has gradually increased, due mostly to the burning of fossil fuels. Now we use the term climate change...

Only 300 years ago, the world’s energy use was very different than it is today. Homes were heated by wood or coal and lit by candles or oil lamps. We used horses, wind-powered boats, and humans to move and transport things. Today, we rely on energy from fossil fuels, natural gas, and...

In the last 50 years, animals have become extinct at a rapid rate, and many other species are critically endangered, meaning they may become extinct soon. Fun Facts Animals are losing habitats for a variety of reasons, almost all caused by humans. Humans...

Every year, we throw billions of tons of trash in landfills. These landfills are ugly and smelly. Toxic chemicals can leach into the soil from them. And what happens when they’re full? Fun Facts One way to keep things out of landfills is to...