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.

Nintendo's Wii. Sony's PlayStation 3 Elite. Microsoft's Xbox 360. They promise a whole new generation of high-definition gaming, but when it comes to the crunch, it's the same old story. As our search for greener electronics continues, it was time for the game consoles to go to our labs for scientific analysis – and all of them tested positive for various hazardous chemicals.

Our analysis, published in our new report, Playing Dirty, detected the use of hazardous chemicals and materials such aspolyvinyl chloride (PVC), phthalates, beryllium and bromine indicative of brominated flame retardants (BFRs).

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This time last year Steve Jobs was ignoring our calls for a greener Apple, but yesterday he revealed the new MacBook Air – the thinnest notebook on the planet and Apple’s greenest computer so far.

It uses less brominated fire retardants (BFRs) and polyvinyl chloride (PVC), but it hasn’t eliminated them entirely. Had it done so, it would have made Apple an ecological leader.