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the amount of carbon dioxide (CO2) produced by the activities of a person or an organisation
carbon footprint
rubbish lying in an open or public place
litter
causing no harm to the environment
eco-friendly
devices, such as fridges or TVs, used in people's homes
household appliances
power used for driving machines, providing heat and light, etc.
energy
_____ car models always attract great attention at exhibitions.
Eco-friendly
Remember to turn off your _____ when they are not used.
household appliances
Small positive changes in your daily habits can help reduce the _____ you produce.
carbon footprint
One of the most important sources of _____ is the sun.
energy
Students are reminded to pick up _____ that they see on the ground.
litter
