We all experience the weather. It changes with the seasons but there are other changes happening over longer periods. This change to the average weather (and to other things too) is called climate change.
The air is made of different gases. One of them is carbon dioxide, or CO2. CO2 is found naturally in the air but is also put there by things that humans do every day. For example, CO2 is put into the air by the engines of buses. It can also be put there by power stations that produce electricity by burning things like coal. When CO2 goes into the air, it makes the air warm up. This is called global warming.
Have you been in a greenhouse? Greenhouses are glass buildings that are used to grow plants. When the sun shines on a greenhouse, the sunlight makes it warmer inside than it is on the outside. Putting CO2 into the air has a similar effect to putting the world in a greenhouse. For this reason, we call gases like CO2 greenhouse gases. Greenhouse gases (GHGs) are ones which act to warm the air, causing global warming. The most well-known one is carbon dioxide. (GHGs).

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