2020年9月18日版 How Big Is Your Carbon Footprint?

How Big Is Your Carbon Footprint? 第2676期
Have you ever heard of the term “carbon footprint?” In fact, your carbon footprint isn’t easy to see. It’s the sum of greenhouse gases(温室气体) caused by your activities. It’s measured in tons of carbon dioxide(二氧化碳).
Many daily activities add to a persons carbon footprint. Think of the last time you rode in the car. A car’s engine burns fuel(燃料). This makes carbon dioxide. Most activities that use electricity(电)create carbon dioxide.
Carbon emissions(排放) can be direct or indirect. The fuel you burn your car is a direct source(来源) of carbon dioxide. But most emissions come from indirect sources. One example is buying an item at a store. Some goods are made in other countries. It takes fuel to ship them to you. Buying those items indirectly causes carbon emissions.
Measuring our carbon footprints is one way to learn about the effect of our activities on the environment. It lets us know that each and every one of us can help reduce greenhouse gases.