Do we depend more on coal or less?

Grade level: 4th – 6th grades

Skills: Bar graphs 

Related environmental issues: Climate Change


The United States depends on coal for electricity generation. When burned, coal emits carbon dioxide (CO2).  Reducing the use of coal helps a lot to reduce CO2 emissions from the nation.  The bar graph below shows the amount of electricity the United States generated from burning coal over the last 10 years.

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  1. In what year did the United States generate the largest amount of electricity from coal?
  2. In what year did the United States generate as much electricity from coal as that in 2011?
  3. In what year did the United States generate the least amount of electricity from coal?
  4. How did the amount of electricity generated from coal change since 2009? Explain.
  5. Do you think the United States could reduce the amount of CO2 emissions since 2009? Why?



Sources: U.S. Energy Information Administration, 2019. Electric Power Monthly, Table 1.1 Net Generation by Energy Source.

Photo: Carbon Tracker



Answer keys

1. 2010

2. 2009

3. 2018

4. Answer may vary.

5. Answer may vary.

Which endangered animal is heavier, Tiger or Leopard?

Grade level: 4th – 5th grades

Skills: Bar graphs

Related environmental issues: Biodiversity

As many as 26,000 species are threatened with extinction in the world because people have changed their habitats, and they lost their homes. The bar graph below shows the weight of some of the most endangered  animals in the world.

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1.Among the endangered animals, which animal weighs the most?

2.Which is heavier, Amur Leopard or Sumatran Orangutan?

3.Which endangered animal weighs twice as much as Hawksbill Sea Turtle?




Answer keys


1.Mountain Gorilla

2.Sumatran Orangutan

3.South China Tiger