Often people consider their carbon footprint to be the result of their immediate use of fossil fuels and energy usage, like cooking with natural gas or using petrol to run their automobile. __3__ This may include the fossil fuel used to transport the food that you buy at your local grocery store, or the energy used to deal with the waste produced in your household.

　　Taking small steps to reduce your carbon footprint and saving energy is actually fairly simple. __4__

　　It requires the burning of fossil fuels to make the bottle, transport it and get rid of it if it's not recycled.

　　Compared with it, in－house filtration(过滤) systems can reduce your influence and cost for water.(待机模式) that wastes energy even when they're not in use.

　　__5__ew energy efficient light bulbs, filters, and appliances could also help reduce your carbon footprint.

　　In a word, less energy used means less greenhouse gas produced. With easy steps, you are on your way to reducing the size of the carbon footprint left behind.

　　A. Cutting off power is the best way to ensure that unnecessary energy is not lost.

　　B. For instance, the use of bottled water leaves a rather significant carbon footprint.

　　C. What fossil fuels may lead to carbon footprints?

　　D. However, wherever we go, we actually leave two sets of footprints.

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