BBC News writes:
"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.
Casey Harrell, toxics campaigner for Greenpeace, said progress had been made but there was room for improvement.
"We're not arguing any more about whether green is good - we're arguing about the definition of green and the pace at which we're getting there," he said.
The campaign group said six companies had refused to take part in the survey - Apple, Asus, Microsoft, Nintendo, Palm and Philips.
Greenpeace said it was disappointing that Apple had refused to cooperate for the second year running, especially since its new range of Macbooks could have scored well."