The invisible threat

A1 A2

The world is getting hotter because by | for | of us!

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The world is getting hotter because __________ us!
Our factories and planes __________ the air dirty.
When __________ sun shines, everything gets hot.
And the dirt stops the hot air from going __________ to the sky.
Because the hot air has nowhere to go, __________ gets hotter.
Already our world is __________ than it was one hundred years ago.
Hot countries may become drier and the people who live there will not be able to grow food. Ice in cold areas __________ changing to water because of higher temperatures.
When this happens, the seas become bigger. Some towns __________ the sea may have a problem soon.
We can help __________ we stop making the air dirty but we must do something fast.