Need:
1 tax system allowing debt cuts
2 renewable-energy economy
or US dies.
Income-tax-based democracies can't shrink debt.
US once had many budget surpluses but ceased after getting mainly funded by income tax after WWII; ditto nearly all democracies.
US debt grew EVERY year 1957-2011 ("surpluses" fake). Data: http://rangevoting.org/USPubDebt.htm
US economy depends on fossil fuels worse than almost any rival; but they're ending.
Because: rivals' high oil tax decades prepared economies for coming disaster.
Solution: switch main US fund source to PIGOVIAN TAXES:
carbon extraction+imports, fish catch, pollution-emis'ns, way-unequal wealth.
Tax collection eased (90% of tax forms & IRS gone); restructures economy
to save fuel+fish, cut pollution.
http://en.wikipedia.org/wiki/Pigou_Club