More than 20 are in China, which is forecast to surpass America and have the most nuclear reactors around 2030.
Britain's mounting debt burden, which is forecast to rise to 78% of GDP by 2014, continued to worry investors.
One young woman raised the issue of global population growth, which is forecast to reach 9.4 billion people by 2075.
Waters are still rising along the Haw, which is forecast to reach major flood stage at Bynum early Friday morning.
At the same time, revenue, which is forecast just over $300 billion this year, is growing much more slowly.
But with the Lib Dems projected to win only 29 seats, a coalition involving Clegg's party looks difficult without involving the SNP, which is forecast to win 54.
The first is the spectacular rise of China's economy, which is forecast to surpass America's in size shortly, in purchasing-power terms.
For the moment, car factories are working flat out to meet demand, which is forecast to rise by 80% by the end of the decade.
The tax rise will do little to restrain the soaring demand for air travel, which is forecast to treble from 180m to 500m passengers a year by 2030.
The slowing flow of retired people has decimated its construction sector, which is forecast to return to growth but remains sluggish today.
But spare a thought for Trawscoed in Wales, which is forecast to be the coldest place in the UK, at a shivering 8C.
