El Hierro biosphere reserves aims to increase energy efficiency and reduce carbon emissions further with a Sustainable Mobility Plan (PDMS), since 50% of the energy consumed on the island is used for transportation.

UNESCO: MEDIA SERVICES

Third, the report says that increasing the use of natural gas and renewables could reduce carbon dioxide emissions by almost 25 percent with the same economic benefits.

CNN: Developing countries encouraged to curb greenhouse gases

And as we move forward over the next several years, my hope is, is that the United States, as one of several countries with a big carbon footprint, can find further ways to reduce our carbon emissions.

WHITEHOUSE: President Obama��s News Conference with Prime Minister Gillard of Australia | The White House

But Renault is also spending a lot of time talking to and doing deals with power companies and governments (which are under intensifying pressure to reduce emissions of carbon dioxide).

ECONOMIST: Renault's electric-car gamble

Governor Arnold Schwarzenegger, defying opposition from business lobbies and some fellow Republicans, agreed with Democrats who control the California legislature to cap the state's greenhouse-gas emissions and reduce carbon-dioxide emissions by 25% by 2020.

ECONOMIST: Politics this week

The UK's commitment to make our fair contribution to reduce emissions in line with keeping global warming below a 2C rise gives a very clear global carbon budget, and hence a UK budget: in other words, how much carbon we can put into the atmosphere over this century.

BBC: Viewpoints: Fracking's risks and benefits

If successful, the firm believes this type of system could form part of a new approach to sustainable farming, making use of urban greenbelts while helping to reduce the carbon footprint associated with food production -- which accounts for up to 30% of total emissions worldwide, according to a 2008 Greenpeace report.

CNN: Farm in the city could be supermarket of the future

These benefits, in combination with growing electricity use worldwide, concerns about limited supplies of fossil fuels, and efforts to reduce carbon-dioxide emissions and prevent climate change, have prompted governments and investors to pour money into this emerging technology.

ECONOMIST: Inside story: Hot rocks and high hopes | The