21.   They recommend measures that make economic sense regardless of whether or not global warming is occurring, such as limiting deforestation and increasing energy efficiency.

22.   Practical measures recommended by the new report include improving energy efficiency, using more natural gas and renewable energy sources like wind and wave power.

23.   A comprehensive energy efficiency labelling scheme for houses has been launched by MVM, a consultancy specialising in property and planning information.

24.   Home energy efficiency is increasingly seen as a route to a reduction in national greenhouse gas emissions.

25.   The number of stars indicates the level of energy efficiency in terms of heating, hot water system, insulation and windows.

26.   The race was only open to vehicles which ran on unorthodox fuels, or which had internal combustion engines modified for greater energy efficiency.

27.   The report, Policy Implications of Global Warming, calls for increased emphasis on energy efficiency and conservation.

28.   Friends of the Earth are sceptical of the idea, arguing that improving energy efficiency remains the most effectuve method of combating global warming.

29.   The report also calls for the provision of strong incentives for the regional power companies to reduce fuel consumption and increase energy efficiency.

30.   A spokesman for the Department of Energy said that the government was determined to improve energy efficiency, but not at a disproportionate cost and effect to the consumer.