Large developing nations such as India and China are predicted to be major emitters of greenhouse gases in the next few decades as their economies grow.

Reid Gardner Station is a major emitter of carbon dioxide, the main greenhouse gas contributing to global warming.

Under the plan all the world's major emitters - both developed and developing countries - would negotiate a new pact in 2015 to cut emissions substantially from 2020.

Plans are to slightly increase this number each year to ultimately have 100% of major emitters in the nation to start keep tabs on the amount they emit.

Australia said it would sign up if major emitters did, while Canada, however, may still hold out.

For the US, it will be impossible to accept any deal unless it is equally legally binding - or non-binding - on all major emitters.

We all major emitters agreed for the first time to have a new comprehensive and binding legal instrument which shall include limits on CO2 emissions.

The primary aluminium and the semiconductor manufacturing industries are the major emitters of hexafluoroethane.

If this is to be a global answer, it must be a global response, and then we also need the other major emitters to make bigger commitments.

"But the major emitters, if we want this to be credible scientifically and environmentally, have to sign on."