A greenhouse is a house made of glass. It
has glass walls and a glass roof. People
grow vegetables and flowers and other
plants in them. A greenhouse stays warm
inside, even during winter. During the
daylight hours, a greenhouse gets
warmer and warmer and stays pretty warm
at night too. This is because the heat
received from the sun is trapped inside the
greenhouse by the glass.
The Earth is also like a greenhouse. During the day Earth’s surface warms up in
the sunlight. At night, the surface cools, releasing the heat back into the air.
But
some of the heat is trapped by gases like carbon
dioxide in the atmosphere. These gases, called
greenhouse gases, work like the glass walls and the
roof and keep the Earth warm. This is global warming
and it is making the Earth a dangerous planet.
Unfortunately, we are making the earth too hot. We
are using oil, gas and coal for running cars, buses,
trains, planes, power stations and so on. These fuels
have carbon in them. This carbon and other gases trap
the heat in the atmosphere and do not allow the earth
to cool down. As a result, the Earth gets hotter.
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