求翻译：从上个世纪90年代以来，世界淡水资源日渐短缺，污染日益严重，水、旱灾害愈演愈烈，使地球生态系统的平衡和稳定遭到破坏，并直接威胁着人类的生存和发展。是什么意思？

Since the 90s of the last century, the world's freshwater resources is the growing shortage, the increasing pollution of water, intensified drought disasters, balance and stability to the destruction of the planet's ecosystems, and a direct threat to human survival and development.

From the previous one since the 1990s, the world's freshwater resources become increasingly scarce, and growing pollution and drought, water has been increasing, so that the earth's ecosystem balance and stability and a direct threat to human survival and development.

Since on century 90's, the world fresh water resources have been short day after day, the pollution is day by day serious, the water, the dry disaster are increasingly fierce, cause the Earth ecosystem balanced and are destructed stably, and is threatening humanity's survival and the development dir

Since the 90 's of the last century, growing shortage of freshwater resources in the world, pollution growing, growing water, drought, making the Earth's ecological balance and stability of the system is compromised, and a direct threat to human survival and development.

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