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61. Almost all our energy comes from oil, coal and natural gas. We call them fossil fuels.
62. The earth’s fossil fuels are running out.
63. Scientists are trying to find and use other alternative sources of energy. 
64. We can use energy from the sun, the wind and the water.
65. The sun supplies all the energy used to grow plants, to evaporate water for rain, and to maintain the temperature of the planet. 
66. If we’re able to collect solar energy, we’ll be sure to make good use of this abundant source of power.
67. Energy from the wind has been used for centuries to move ships, grind grain, pump water and do other forms of work.
68. Recently, wind power has been used to generate electricity.
69. For a long time, people have used water to power machines. 
70. Today water power is mostly used to generate electricity.

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$61$. Almost all our energy comes from oil, coal and natural gas. We call them fossil fuels.
$62$. The earth’s fossil fuels are running out.
$63$. Scientists are trying to find and use other alternative sources of energy. 
$64$. We can use energy from the sun, the wind and the water.
$65$. The sun supplies all the energy used to grow plants, to evaporate water for rain, and to maintain the temperature of the planet. 
$66$. If we’re able to collect solar energy, we’ll be sure to make good use of this abundant source of power.
$67$. Energy from the wind has been used for centuries to move ships, grind grain, pump water and do other forms of work.
$68$. Recently, wind power has been used to generate electricity.
$69$. For a long time, people have used water to power machines. 
$70$. Today water power is mostly used to generate electricity.