Water is a basic need for us. Life wouldn't be possible on Earth without it. And it might seem that there's plenty of it on our blue planet, but the fact is that only three per cent of the water is fresh, and it is not distributed evenly: some areas of the world have a lot, while it is very scarce in some others. A tap is not available for millions of people, who hardly have access to any water at all.
Listen to Leonardo DiCaprio and learn about the problems we face if we don't start using this fundamental resource wisely.