1 Complete the text using the correct form of the verbs in brackets. Scientists are very worried about the effects of global warming. If the ice in the Arctic and Antarctic regions 1____________ (melt), sea levels 2____________ (rise) and cause severe floods. People who now live in coastal areas 3____________ (lose) their homes. It 4____________ (also affect) the temperature of the sea. If the sea 5____________ (get) colder, the northern half of the world 6____________ (freeze). There would be incredible snow storms and millions of people 7____________ (die).