I found myself contemplating a novel solution for the strain that humans are placing on the environment. What if future generations of people were genetically modified to reach a maximum height of three feet tall? It seems to me that this would essentially halve the environmental costs associated with an individual's footprint, whether that scales up better or worse, though, I'm not sure.
Obviously this isn't practical, and even if it was, there are certainly many reasons why it isn't a good idea, but it caught my fancy, and so I thought I would share.
-Matt