Makes sense.

A lot of people don't get that part, but global warming = more energy in the entire system that is planet Earth.

So it's not just over-all hotter. You get stuff like wind or current pattern changes too. Or even stuff like locally becoming colder, because the energy got moved elsewhere by said changes in air and water patterns.

So... yeah. Bad, bad news if your only source of water is, for example, the rains that used to come like clockwork once or twice a year. Or the glacier that simply isn't getting enough snow on top anymore.