Tuvalu, an island country of which the highest altitude above sea level is mere 4m (13ft), is in danger of being submerged owing to global warming. Two out of nine islands already disappeared. However, the greater fear than the probability of losing their territory someday is the shortage of drinking water which has to be solved right now.

The most parts of Tuvalu are low lying atolls, and so it is hard to get drinking water. The ground water is salted and unsuitable for drinking. Residents depend on rain. The rain falls on Tuvalu is the very water of life. A water tank is a must-have item. These days, when drought becomes more severe owing to climate change, they need more water catchment facilities and water storages as they are immediately in need of drinking water. However, the majority cannot afford an expensive water tank because they do not have jobs.