Saturday Photo: Irrigation, or Another of the Things that Concrete Has Wrought

This was taken last summer near Chief Joseph Dam on the Columbia River.  It shows dramatically the effect of irrigation on the dry lands of the region. 

Concrete made this possible.  It has also contributed mightily to the problems of climate change that we are seeing this summer. 

I've been thinking a lot about this as I reflect on what concrete has wrought for my book Rock of Ages: How Concrete Built the World As We Know It. Lots of good things...but also some very questionable ones.  More about that later.