In Texas, where you and I both live, there are also water issues. This summer in Austin we had water rationing. On the outskirts of town, people were told not to water their yards at all. Recently it has been raining, but the creeks aren’t flowing yet … I’d say we’re not out of the woods yet with respect to the central Texas drought. I think of cities in India and other parts of the world, where water only runs in the pipes for a few hours each day, or arrives via truck. That could happen here, you know. Water is a finite resource, and we have to understand its use, and use it wisely.

Human activity has created changes in the flow of rivers across the world. Growing population has used more water. Even if you don’t believe in climate change, you surely believe that human population is growing. Scientists are just trying to study the situation – to make sure we all have enough water to drink and use for agriculture.