President Obama recently visited the drought-stricken Central Valley of California and announced his administration's response: he wants to spend another billion dollars to study climate change.
I can save him the trouble. The planet has been warming - on and off - since the last ice age, when glaciers covered much of North America. The climate has been changing since the planet formed, often much more abruptly than it has in recent millennia.
Until the earth begins moving into its next ice age, we can reasonably expect it to continue to warm. That will mean less water can be stored in snow packs and therefore more water will need to be stored behind dams.
There, I just saved a billion dollars.