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to a build-up of greenhouse gases in the atmosphere. Do scientists agree about global warming?
Scientists who study the climate are still arguing about how fast the earth is warming
and how much it will warm, but they do agree that the earth is warming and that it will
keep warming if we don’t do anything about it. What Causes Global Warming? Scientists agree that the burning of fossil fuels like oil and coal cause greenhouse gases
to escape into the air and that these gases are causing most of the warming. Another
cause is deforestation (cutting down trees). Trees soak up carbon dioxide, one of the
greenhouse gases, from the air. What are 'Greenhouse Gases'? The atmosphere which surrounds the Earth contains the greenhouse gases, sometimes in very small amounts. The list of gases below shows the greenhouse gases which are produced naturally on Earth.
• carbon dioxide, water vapour, methane and ozone These gases are very important in keeping the Earth’s
temperature at the correct level so that we can live. To
do this, the amount of greenhouse gases in the
atmosphere must be kept at the right balance. The Atmosphere Natural sources of greenhouse gases Methane comes from cattle as they
digest their food. The gas also
comes from fields where rice is
grown: paddy fields.
Ozone occurs naturally in the atmosphere. Carbon dioxide is produced naturally
when people and animals breathe. Plants
and trees take in and use carbon dioxide
to live. Volcanoes also produce carbon
dioxide. These gases are very important in keeping the Earth’stemperature at the correct level so that we can live. To do this, the amount of greenhouse gases in theatmosphere must be kept at the right balance. Carbon dioxide comes from the burning of fuel such as coal, oil and gas. These are called fossil fuels. We burn fossil fuels to make energy, which gives us heat and light inbuildings. The cutting down and burning of trees also releases carbon dioxide.Methane can be released from buried waste. For example, the rubbish that is collected from our homes by the dustmen is buried in large rubbish dumps. CARBON DIOXIDE Then I can start to type