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).