Lake Chad is one of the many endangered bodies of water around the world.
As a result of water over-use due to agriculture, the size of the lake was rapidly shrinking, however, in the past 10 years, statellites have noticed a modest growth in the Lake's size. Let's hope that this new trend will continue, otherwise 10s of millions of people will be left without access to fresh water in an otherwise arid region.
If you'd like to read more about the lake, check out it's wikipedia article!
