As nations debated pro and cons of the issue, India neither supported nor opposed it and instead merely read out a joint-bilateral statement on HFCs signed by Prime Minister Narendra Modi and US President Barack Obama during their White House summit on September 30.

When contacted, Indian officials known to the development pointed out that it was done to "clarify" country's stand after Canada, while moving the amendment, referred to "a change" in India's approach on the issue.

India's unclear stand has irked the green groups attending the conference.

"I can't understand why a bilateral deal read out in multilateral forum," climate expert and deputy director general of Centre for Science and Environment, Chandra Bhushan, said.

On the opening day of the conference on Monday, India had not opposed to participate in discussing on the agenda on the issue of harmful greenhouse gas under United Nations Montreal Protocol on ozone depleting substances.

As the debate is still on, a breakthrough on the issue of HFCs is highly unlikely as oil producing gulf countries participating in a key UN conference here continued their strong opposition to the US-led nations' proposal to amend the Montreal Protocol to phase down the harmful greenhouse gas.

During the debate on Tuesday, oil producing Gulf nations led by Saudi Arabia and Kuwait opposed to setting up a contact group on the issue, arguing that the Montreal Protocol does not have the mandate to deal with the greenhouse gas.

They said that the issue should be discussed under the United Nations Framework Convention on Climate Change (UNFCCC).

Montreal Protocol is a UN treaty signed in 1987 to ban ozone-depleting substances like chloroflurocarbons (CFCs) and hydrochloroflurocarbons (HCFCs), which were used in refrigerators and air conditions.

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