Read the passage and answer. Every year the monsoon brings life-giving rain to Pakistan, but in 2022 it brought catastrophe. Unusually heavy rainfall, combined with melting glaciers, submerged about a third of the country, destroyed homes and crops, and displaced millions. Pakistan contributes less than one per cent of global greenhouse gas emissions, yet it is among the countries most vulnerable to climate change. Many argue, therefore, that wealthy industrialised nations bear a moral responsibility to help countries like Pakistan adapt to a crisis they did little to create. The main argument of the final sentence is that:

1. rich nations should help vulnerable countries adapt to climate change
2. the monsoon should be stopped
3. Pakistan emits most greenhouse gases
4. Pakistan caused the floods

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