Microbes are used to make methane.

Methane is held in containers so it won’t escape.

Farms benefit from the extra food from stores.

Methane is converted into electric power.

To encourage the reader not to waste food

To show the reader that many different types of biofuels are being used

To demonstrate that creativity can help solve environmental problems

To argue the importance of preventing methane from escaping into the atmosphere

To show how the silos use bacteria to change the food waste into methane

To describe how vehicles use the biofuel created by the silos

To emphasize that the silos produce the same amount of methane as landfills

To suggest that the food waste collected in silos comes mainly from leftover meals

To suggest that it is difficult to collect food waste

To argue that food waste is a growing problem

To highlight that food waste is a renewable and useful resource

To reveal that food waste is difficult to control