Brasilia welcomes from Sunday the World Water Forum, to try to find solutions to supply problems of growing concern and affecting already several cities in the world, including Cape Town.
Nearly 40,000 people are expected in the capital of Brazil for this eighth edition of the Forum, including about fifteen heads of state, 300 mayors of cities around the world, and several dozen scientists and environmental activists, up to on March 23.
Global warming, river pollution, overconsumption of private individuals, farmers and industrialists: a source of life, water is threatened everywhere.
"There are more dams, more vehicles, more production and more inhabitants, for measures of protection still very weak compared to the impact already felt ", explains to AFP Ney Maranhao, director of the National Agency of Water (ANA), organization Brazilian regulator.
Monday, Unesco must make public in Brasilia its annual report entitled "Solutions based on nature, for water."
For the director of the forum, Ricardo Medeiros, the question of water must be thought beyond the purely environmental aspect
"It is now necessary to go beyond the traditional speech evoking an essential element of life, to recognize it as an engine of development", added this engineer, member of the World Water Council, NGO based in Marseille (South of France) which organizes the forum every three years
"It is clear that the traditional speeches do not work", adds Coling Strong, American specialist author of a report on the public management global water problems
"We can manage a situation drought if we have a plan beforehand to respond to the crisis. But if cities do not have the means to respond to supply problems, there will be other situations like Cape Town, "he says.
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More than a quarter of renewable water resources (which do not include Antarctic ice, about 60% of the planet's reserves) are found in Latin America, compared to 60 times less in the Middle East and North Africa, regions with critical per capita resources.
Experts are concerned about possible extinction, in a few days ten years ago, aquifer reserves in part of the Ganges basin in India, southern Spain and Italy, or in the central valley of California.
Brazil, where 18% of the planet's drinking water is also hit hard by global warming. Some areas in the north-east of the country have been affected by the longest drought in their history since 2012.
"Water must be an element that unites communities, nations, not the motive for World War III, as some say, aims to share good practices, solutions and experiences, to boost cooperation between countries, "says Ricardo Medeiros.