For example, some interesting restoration is underway with the Los Angeles River in Southern California. From 1914 to 1938 a number of floods caused much devastation and substantial death along the river. In response, in 1940 the US Army Corps of Engineers began to channelize the river pulling it between concrete walls.
I’m now very pleased to see the work underway to restore the Los Angeles River. And while some may find aesthetic pleasure in a concrete channel I think most of us would rather see rocky rapids, islands of emergent vegetation, and wildlife fill the channel.
Several of us have formed an Environmental Aesthetics Study Group. Membership is free and by invitation. For an invitation contact firstname.lastname@example.org.