The global power sector -- the biggest single contributor to climate change -- is ducking its responsibility to reduce greenhouse gas emissions by failing to invest significant amounts in renewables. So says a report by the World Wildlife Fund (WWF). "Ranking Power" reveals how green electricity companies are. It looks at 72 of the world's leading power retailers, between them producing two-thirds of all electricity in OECD countries and Russia, and ranks them in order of their use and investment plans in renewables and efficient natural gas. Overall the picture is gloomy, with some 60% receiving a ranking of less than one out of ten, while 90% rank less than three out of ten. Best of a dismal global crop is Iberdrola of Spain, the world's leading wind plant owner, with 4.3 points, but another Spanish company, Union Fenosa, scored last among Europeans with 0.4. Second highest score goes to America's FPL group (4.1), owner of the second largest volume of wind power, and third is ScottishPower (3.7), also a major wind plant operator. Bottom of the table with zero scores are seven US companies, five Japanese and one Australian. The report was released at the launch of WWF's PowerSwitch! Campaign in over 20 countries, which urges companies and governments to switch from coal to clean energy. The goal is a carbon free power sector by 2050 in industrialised countries and to trigger a major switch away from coal in developing countries in that time.