UN experts predict that by 2030 47% of the world's population will live under the threat of water deficit. Already, many countries in Africa, the Middle East, Asia, Central and South America are experiencing serious problems due to lack of fresh water. According to experts, every year from diseases associated with poor quality water killed at least 1.8 million children under the age of five. Half the world's population today lives in cities, most of whom do not have the resources and infrastructure necessary for effective treatment and wastewater treatment. In a message on the occasion of World Water Day UN Secretary General Ban Ki-moon said today that are under threat as the quality of drinking water and general water reserves on the planet. Dirty water kills as many people as war and violence, says the UN. Our topic 'That's interesting' last week also focused on the water – we have told it about 15 interesting facts about water. The whole world was plunged into darkness in the shares' Hour Earth 'On the last Saturday of the planet, hosted an international environmental action' Earth Hour '. Beginning with New Zealand, to this popular international event joined by more than 100 countries in various parts of our planet. 'Hour Earth 'in 2010 was the most ambitious environmental action among all ever held in Russia, dozens of cities in the country supported the call for the World Wildlife Fund, one hour off the lights and electrical appliances to draw attention to climate change.