Study the article, Figure 1.4, in the annexure before answering the following questions. 1.4.1 In your own words, explainthe role of the ozone layer? 1.4.2 List any TWO effects of ozone depletion. 1.4.3 Name the gas mainly responsible for ozone depletion. 1.4 (1x2)(2) (2x2)(4) (1x2)(2) 1.4.4 The article mentions the Montreal Protocol. Write a short paragraph in which you describe how the countries that signed the Montreal Protocol aimed to reduce ozone depletion. (2x2)(4) Severe ozone depletion avoided May 26, 2015 We are already reaping the rewards of the Montreal Protocol, with the ozone layer in much better shape than it would have been without the UN treaty, according to a new study in Nature Communications. Study lead author Professor Martyn Chipperfield, from the School of Earth & Environment at the University of Leeds, said: "Our research confirms the importance of the Montreal Protocol and shows that we have already had real benefits. We knew that it would save us from large ozone loss 'in the future', but in fact we are already past the point when things would have become noticeably worse." Although the Montreal Protocol came into force in 1987 and restricted the use of ozone- depleting substances, atmospheric concentrations of these harmful substances continued to rise as they can survive in the atmosphere for many years. Concentrations peaked in 1993 and have subsequently declined. 8​