Half of the largest cities in the world experience a scarcity of water.

The above statement is True.

Water scarcity affects half of the world's most populous cities. Despite the fact that only 0.014 per cent of all water on Earth is both fresh and easily accessible (the remaining water is 97 per cent saline and less than 3% is difficult to get), there is technically not enough fresh water on a global scale for humanity to get by.