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In terms of greenhouse gases, there has been a modest improvement in the U.S. over the last 20 years in emissions per hour of work. If I may put it crudely, in 2011, the average worker emitted about a ton of GHGs per week compared to about 1.12 tons in 1990. Of course the workers didn't emit the GHGs but when you look at the historical relationship between hours and emissions it's easy to get that impression. There is a very strong correlation between hours of work and GHG emission -- stronger than the correlation between population, labor force or GDP and emissions. Here's a little chart I cobbled together to illustrate:
