The quarterly Greenpeace Guide, which ranks personal electronics manufacturers according to their green credentials, has listed Nintendo and Microsoft at the bottom of their list.

The guide was first started in August 2006 and is now in its eighth edition.

It ranks the top market leaders of the mobile phone, computer, TV and games console markets according to their policies and practices on toxic chemicals and recycling.

The organisation said that the guide has already led to a reduction in the amount of toxic chemicals being used in the electronics industry.

“We know that brands are putting pressure on their suppliers to meet our commitments,” said Ms Kruszewska.

The latest guide also includes new stricter guidelines.

“For this edition we tightened the e-waste and chemical criteria and we also added a new energy requirement,” said Ms Kruszewska.

The new energy guidelines score a company for disclosing their greenhouse gas emissions, their commitment to absolute cuts in their own emissions and support for mandatory global emissions reductions.

In particular, Greenpeace has asked companies to state support for a “strong post Kyoto agreement” on their international websites.

“We see companies scoring zero on all energy criteria,” added Ms Kruszewska.

“Clearly it is going to take companies some time to improve on our demands,”

The latest guide also assessed the energy efficiency of a selection of each company’s products to see if they meet or exceed the US Environmental Protection Agency’s Energy Star rating.