In his 2003 speech at Rice University's Energy&Nanotechnology Conference, the late nobel laureate Richard Smalley highlighted the _____ 10 problems for the next 50 years. In his list, _____ sits at the top, and water comes next. Now, with the price of solar power going down, the dawn of a new energy _____ is just around the corner. As a result, _____ is going to be the greatest challenge for humanity. But the water problem is ____. First, unlike coal and oil, water cannot be _____ .Second water is _____ with every other sector of society. Third, while water demands are growing, climate change is intensifying droughts and floods and water supplies are _____. There are solutions, such as building water -transfer aqueducts, hydroelectric dams and designation plants. But they may be incredibly expensive. It will ______ for scientists to find affordable solutions to the water problem. Before that, everyone should do his or her bid to _____ water.