Hey, how do I download it?
This is a warmer, and there is nothing to download. It's just an idea for your lesson, not a worksheet.
Draw an island and make sentences about what would happen if they cut down the trees there. Make a bunch of cards and put into two boxes. In one of the boxes put conditions and in the other one the results. Students must take one card and say for example if they built a factory, they would... And another student takes a word from the 'results' box and finishes the sentences.