Exercise 7. Put in the correct prepositions m the blanks.

It is now almost certain that global warming has been directly caused(1) __________man's use of fossil fuels. This has led(2) __________an international debate aboutwhat we should do to reduce the negative effects(3) __________our actions and how we can make the planet safe for our children's children to live in. One consequence (4) __________this debate has been to improve the level of "green" education inschools and this should result(5) __________greater awareness of this difficult issue in the long term. However, in the short term there still remains much to be done. The reason(6) __________this is that we need to address causes(7) __________the immediate problem.