India is considering a new model based on the sharing of carbon dioxide emissions between nations in the global climate talks to be held at Cancun in Mexico in December.

The new model, which may form part of India's negotiation strategy at Mexico, is based on the concept of a "carbon space," which is the total amount of acceptable carbon dioxide emissions, and "carbon budget," which is the sharing of carbon space between nations.

"
India will not accept any global climate change agreement in which equity is absent, equitable access to global atmospheric space is absent," its Environment Minister Jairam Ramesh said at the conference to debate the new model.

He said
India 's climate change negotiations must be based both on per capita emissions and per capita income.

India has among the world's lowest per capita emissions, while a country such as Australia accounts for only around 1.5% of global emissions but is the developed world's biggest per capita polluter.

Ramesh said if this global carbon budget principle is accepted,
India will be one of the biggest beneficiaries as it hasn't used the carbon space to which it is historically entitled to.

As part of its per capita emission stand,
India has previously argued that countries with low per capita emissions have lesser responsibility to undertake climate change actions compared with developed countries, which account for most greenhouse gases in the atmosphere.

"In the next six months, in the runup to the
Cancun [climate talks] in December, India will take the leadership role on the issue of global carbon budget and equitable access to global atmospheric space," the minister said.

He said one of the problems of the climate change debate so far was the absence of economic criteria. "We need to introduce an economic principle," he said.

India already has support from developed countries such as Germany and France for the concept, as well as the support of the BASIC nations of Brazil , South Africa and China , and intends to build a larger support base, he said.

However, Ramesh said a global agreement at
Cancun was highly unlikely.

"As things stand right now I'm not very optimistic of a global agreement at
Cancun . There may be some side agreements," he said.