Global warming is the warming of the Earth's surface. It is often referred to as the green house effect.
Greenhouse gases such as carbon dioxide trap radiation that would normally escape back to space, this warms the atmosphere.
Carbon source - releases CO2 for example car exhausts.
Carbon sink - where carbon accumulates for example forest or under oceans.
Carbon footprint - the amount of carbon each person produces living their lives.
Carbon neutral - offsetting, companies plant so many trees for the amount of CO2 they produce and claim they are carbon neutral.
Food miles - how far food travels before it reaches the shop its being sold at.
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