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3. Put the words in the sentences into correct word order:

1. but / more / Today / growing / than / is / this / 20% / is / of / desert / land.

2. already / that / scientists / The trees / say / the / changes / in / disappearance / the / is / of / causing/ climate.

3. plants / the / to make / and / help / in / other / the / we / air / breathe / Trees forest / that.

4. of / rain / main / The effect / acid / of / to damage / is / soil / the / balance / chemical / the.