4. Most of the construction now and going forward is multi-family housing, where we balkanize millions
of formerly mid-wage families and their progeny from their own homes into apartments and other little non-owned and sometimes mean little enclaves,. The US is trying to prop up the market with the $40 billion invested in the wealthiest people's mortgage-backed assets every month (which pay much higher interest rates than nearly anyone can get at the bank, btw), as well as zero interest loans for the big banks (which depress rates for retirement accounts and deprive a lot of seniors from the income they were told they would have in their retirement. By very serious people, I might add).
The home builders are just happy to have work, regardless of what they are building, houses or coffins on stilts. They are more concerned that people maintain the air-driven tools well, and don't get weighed down with the whole moral argument thing.
I suspect there will be hundreds of short-lived opportunities from what people used to know in the old world (prior to 2008) but I would think your better bet for sustainable and greater return on investment will come from the problems you can solve in environmental science. Especially if you know a little Chinese or Spanish.
Just another Internet opinion, eh Who knows, real money into people's pockets in all the depressed markets may appear at any time and change all this.