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不同气候地区的人们对环境与发展问题的认识不同。温带地区的生态学者还未认识到将水功能引入广泛的环境问题中的必要性，而在干旱的热带和亚热带地区，即大部分贫穷国家所在地区，水对于社会发展则是十分突出的问题。阐述与环境和发展有关的水循环问题。
People in different climate regions have different understandings of the environment and development issues. Ecologists in temperate regions have not yet recognized the need to introduce water functions into a wide range of environmental issues, and water is a prominent issue for social development in the arid tropical and subtropical regions, where most poor countries are located. Describe the water cycle issues related to the environment and development.