Here are the corrections for grammar and clarity:
- In the first sentence, "south Asia" should be capitalized as "South Asia."
- In the first sentence, "gas emissions" could be more clearly referred to as "emissions of gases" for better flow, but this is merely a stylistic suggestion.
- In the second sentence, it would be more precise to say "the need for housing and infrastructure" instead of "all the houses and more that need to be built."
- In the third sentence, "leads to problems with water management which can lead to water shortages." There should be a comma before "which" to clarify the sentence: "leads to problems with water management, which can lead to water shortages."
Overall, the paragraph is clear but could benefit from these minor adjustments for improved grammar and clarity.