Worldwide, hundreds of billions of dollars have been invested in finding a solution to the water shortage creating alternative energy sources combating air pollution and energy efficiency. The 16th annual CleanTech expo, held this month in Tel Aviv, was a mecca for anyone seeking to increase efficiency, save money, and "green up" his or her lifestyle, as well as providing a marketing edge. The expo displayed a number of green solutions, including water technologies gas and sewage infrastructures options for green building, wastewater treatment, recycling, and gardening. Among the technologies Ynet discovered at the show were two-sided solar kits and mobile solar units that provide electricity for home use. CleanTech founder Haim Allush described it as an excellent opportunity to network and hold business meetings with senior decision-makers in the industrial sector and in local and national government, as well as with researchers and investors from Israel and abroad. Follow Ynetnews on Facebook and Twitter