Insufficient rain leads to rivers drying up, when __________________ becomes a big problem. ____ Old cars, which produce a lot of __________________, aren’t allowed to enter the centre of Madrid. ____ When trees and plants don’t protect the ground, weather can cause __________________. ____ Air pollution can cause the formation of clouds which produce __________________. ____ Certain gases in our atmosphere, such as methane and carbon dioxide, contribute to the __________________, which warms up the planet____

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