The world's gadget makers have become more environmentally friendly but have some way to go before they can claim to be green.

That's the verdict of a report by Greenpeace launched at the Consumer Electronics Show (CES) in Las Vegas. The pressure group collaborated with the electronics industry in a study which saw fifteen companies submit fifty of their most environmentally friendly brands for examination.

The products were marked on three main criteria - use of hazardous chemicals, power consumption and recycling. The highest-scoring product was Lenovo's 24in (61cm) widescreen monitor, which scored 6.9 out of 10. The lowest scores were recorded by Acer, with 3.3 for its Veriton desktop computer.