However, non-greenhouse gas emissions are not a significant problem, as the U.S. Environmental Protection Agency reports emissions of the Six Principal Pollutants have declined to less than a third of 1980 emissions levels.

FORBES: Obama Unites Global Warming Alarmists, Skeptics In Presidential Debates

Cellulosic ethanol uses non-food feed stocks with significant greenhouse gas emission reductions, and the first commercial-scale plant is being built today in Soperton, Ga.

FORBES: Khosla Speaks

At the annual meeting of the Carbon Disclosure Project--a non-profit investor organization devoted to greater transparency in greenhouse gas emission statistics--Sun released a set of open-source software tools that companies can use to track carbon emissions.

FORBES: Magazine Article

"HSBC's decision sets a new benchmark for the financial services sector, " said Steve Howard, chief executive of The Climate Group, a non-profit coalition of organisations committed to reducing their greenhouse gas emissions, of which HSBC is a member.

BBC: NEWS | Business | HSBC bank to go carbon neutral

Sir David King, Tony Blair's chief scientist, recently argued that one further generation of nuclear power stations is needed (in Britain at least) to buy time, in order to keep down emissions of carbon dioxide, the chief greenhouse gas, while new carbon-free non-nuclear technologies are developed.

ECONOMIST: Nuclear power

This opened the door to so-called advanced biofuels that use easy-to-grow, non-food crops to produce fuels that, if they can ever be commercialized, will produce drastic greenhouse gas reductions.

FORBES: Obama: Corn Ethanol Isn't So Bad After All