There's an economic argument that progressive taxes can act as automatic stabilisers that dampen fluctuations in real GDP of the economy. So in an expansionary economy people pay more as a proportion of their income in tax, and in a recessionary economy it's the opposite. This can help to avoid government action which generally lags significantly and can just amplify the boom or bust.
githin writes: "Lawmaker wants to replace traditional incandescent bulbs with compact fluorescent ones by 2012 in move to reduce energy use, greenhouse gases. A California lawmaker wants to make his state the first to ban incandescent lightbulbs as part of California's groundbreaking initiatives to reduce energy use and greenhouse gases blamed for global warming. For more, http://money.cnn.com/2007/01/31/news/companies/bc