The warming of the Earth is caused by exhaust gas from automobile engines, fatories and power (1)_____ . Carbon dioxide goes up into the atmosphere, and it form a kind of screen that keeps or allows the sunshine in but stop the Earth heart (2)______ getting out. It works like a greenhouse, that’s why we call (3)______ the Green House effect. Because of this effect, the Earth is getting warmer all the time. This (4)______ in temperature will cause big changes to the world’s climate. The sea level will increase as the ice (5)______ the poles will melt.