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The greenhouse effect in simple terms is the warming of Earth's surface.

One way it can be described as a world problem is the melting of ice in Antarctica, because of global warming, the ice is slowly melting, killing lots of animals.

Another way it can be described as a world problem is that the global sea level is rising. Because of these melting ice-caps, sea level is slowly rising and could potentially flood some cities or towns in the next few years.

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