Energy Star is an international scheme that awards products with an Energy Star label if they meet set energy-efficiency standards.
First created by the US government in 1992, it has since been adopted by Australia, Canada, Japan, New Zealand, Taiwan and the European Union.
The standard applies to a wide range of products, including computers, white goods and electrical appliance, and has also been extended to cover buildings.
The requirements for the standard are updated regularly and aim to ensure that only the most efficient products in a given category can carry the label.
Co-working giant has told global staff it won't serve meat in its buildings or reimburse meals on expenses where meat was eaten, in a bold bid to cut emissions
New Green Party report warns surge in waste incineration levels mean valuable materials are going up in flames
Green Alliance's Libby Peake argues UK steel sector can carve a profitable niche with a climate-friendly product, but it needs government help to get there
Bumper six months for wind power in Spain means low carbon sources contributed 67.5 per cent of country's generation