carbon dioxide - Gas emitted by burning fossil fuels, methane - Gas emitted by burping cattle, CFC - Gas emitted by old cooling/ fridge units, dust - Material from volcanoes which blocks the sun and cools the planet, sunspots - Area of intense activity on the surface of the sun, orbit - Changes in this mean the Earth is sometimes further from the sun, permafrost - This is melting rapidly in the tundra - releasing methane, rice - Methane is released when this crop is grown, landfill - Where we send our rubbish to decompose, ocean currents - When these change position, climate in that region changes. (5,8), cars - These give out nitrous oxide and ownership of them is increasing rapidly, greenhouse gases - Substances that trap heat in the atmosphere warming our planet (10,5),

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