We need some ____ gases in our atmosphere, Without them the ____ would be about 18 °C ____ on average than it is now. That would make it too cold to ____ life as we know it. Greenhouse ____ present in the ____ include: water vapor, ____ and methane. These greenhouse gases ____ long wavelength ____ emitted from the Earth then release ____ in all directions, which keeps the Earth warm. ____ too much ____ fuel and ____ is causing too much carbon dioxide to ____ up in the atmosphere, increasing Earths ____ temperature. This gradual ____ in the earths average ____ is referred to as ____ warming. This could have serious ____ consequences for our ____.

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