Six and a Half Billion
With George Bush in office, we'll drown most of those as a result of oceans rising due to global warming and the associated climate changes and flooding - that is the ones that don't die in the world war he's working up to. A few days of "nuk-u-lar" exchange in the Middle East and here should pretty much cut down about a half billion or so, especially after the fallout hits China, too. And of course a few nukes in the six cities where he's handing over control of the ports will pretty much decimate our small 300 million population and leave us oh, several million less. So don't worry about population 'explosion' - it's under control.