When the first comprehensive report in years to examine energy use by computer servers was published in February 2007, it was greeted with surprise by industry insiders. Jonathan Koomey, a staff scientist at Lawrence Berkeley National Laboratory in California, found that worldwide power consumption by servers had doubled between 2000 and 2005. "Everyone thought CO2 emissions were a problem for transportation and big energy," says Bill St Arnaud of Canarie, Canada's internet development organisation in Ottawa, Ontario.

Governments in many countries are increasingly aware of the urgent need to make better use of the world's energy resources. Improved energy efficiency is often the most economic and readily available means of improving energy security and reducing greenhouse gas emissions. To support better energy efficiency policy-making and evaluation, the International Energy Agency is developing in-depth indicators of energy use, efficiency trends and CO2 emissions. This publication provides a summary of the key results of the indicators work so far.

A sustainable energy supply is a precondition for economic and social development and achievement of the Millennium Development Goals. In many parts of the world, a large share of the population have no access to modern energy services. At best, towns and industries are supplied with antiquated and unsustainable energy facilities.

The more stringent environmental quality specifications for oil products worldwide are tending to step up energy use and, consequently, CO2 emissions at refineries. In Brazil, for example, the stipulated reduction in the sulfur content of diesel and gasoline between 2002 and 2009 should increase the energy use of Brazil's refining industry by around 30%, with effects on its CO2 emissions.

Energy: Could new techniques for producing ethanol make old-fashioned trees the biofuel of the future?

The memory of last year's oil price hike, and its economic and political fallouts, has faded from memory. As India awaits the 2007-08 Union budget, newspapers are abuzz with reports of more tax cuts

The cement sector has another big potential