The latest edition of our Guide to Greener Electronics has revealed that very few firms are showing true climate leadership. Despite many green claims, major companies like Dell, Microsoft, Lenovo, LG, Samsung and Apple are failing to support the necessary levels of global cuts in emissions and make the absolute cuts in their own emissions that are required to tackle climate change.

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Company scores plummeted in the previous edition of Greenpeace's Guide to Greener Electronics, when new criteria on climate change were introduced. However, leading brands like Nokia and Samsung are now making significant progress in greening their electronics products, with improved environmental policies responding not only to these new energy criteria, but also to the more stringent chemical and e-waste criteria.

Do you know what happens to your old telly once it conks out and you chuck it away? Well, it gets dumped onto developing countries in Asia and Africa as 'second hand goods' where unprotected workers (often kids) dismantle computers and TVs in search of metals that can be sold. The remaining plastic, cables and casing is either burnt in an e-waste pyre or simply dumped. Let me take you on a virtual journey to the 'scrapyards' of Ghana where some of the electronic waste from the western world ends up.

With expanded and tougher criteria on toxic chemicals, electronic waste and new criteria on climate change only Sony and Sony Ericsson score more than 5/10 in our latest Guide to Greener Electronics. Nintendo and Microsoft remain rooted to the bottom of the Guide.

The Greener Electronics Guide is our way of getting the electronics industry to face up to the problem of e-waste. We want manufacturers to get rid of harmful chemicals in their products. We want to see an end to the stories of unprotected child labourers scavenging mountains of cast-off gadgets created by society's gizmo-loving ways.

With Christmas getting ever closer we've some unfestive bad news for gaming giants Nintendo, makers of the popular Wii, Gamecube and Game Boy consoles. They've achieved a spectacular zero score in the latest edition of our quarterly Greener Electronics Guide - the first time such a feat has ever been accomplished.

The guide ranks companies on the toxic content of their products and their willingness to take back and recycle them once they become redundant. This is the first time that we've included gaming consoles, giving Nintendo the chance to leap straight into last place - an opportunity they grasped with both hands!

Acer and Lenovo are the latest of the top computer makers to commit to stop using the worst toxic chemicals in their products. Along with Motorola these companies are the biggest movers in the latest version of our Guide to Greener Electronics. Disappointingly for Mac fans, Apple has dropped to last place.