After a decade of promise, advanced biofuels makers are entering a crucial make-or-break period with the first of a new generation of production facilities about to come on line.

The European Union's climate chief said on Tuesday she hopes countries opposed to its rules that charge airlines for carbon emissions take their complaints to the U.N.

Stocks of solar power companies were mostly higher on Friday after California regulators voted on Thursday to raise the state's renewable energy target.

California's Air Resources Board approved an increase in the share of electricity in the state that is produced from renewable energy sources to 33 percent by 2020 from 20 percent by 2010.

However, an initiative in front of California voters