United Nations officials had expected that these avoidable deaths would become the focus of the world’s news agencies through the report of the 3rd World Water ______.
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______________ solutions such as solar-powered desalination plants are very useful.
In the rich North, toilets using water are the largest single__________ on domestic water supplies.
It is not a must for the developing countries that currently lack adequate capital to __________ this wasteful practice.
They need toilets which can safely turn human waste into a smellless, soil-like ________.