"If you are the same negotiator for your country for 15 years and you repeat the same thing, you are not even listening," British foreign secretary's special representative for climate change David King told PTI on the sidelines of an event at the IIT Bombay.
King was referring to the rounds of talks over the past few years that have failed to bring consensus on the per capita carbon emission reduction.
"We can't go on arguing about the points of detail, legal points etc. It's time everybody come to an agreement that is equitable and meets the nature of the challenge," King added.
Earlier, addressing a seminar at the IIT on climate change, he said that by 2050 all countries must reach the target of cutting down the per capita carbon footprint to two tonnes.
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Acknowledging that the per capita carbon footprint in India - where economic development started late - stands at a lower 1.8 tonne at present, King said the international community can take historical facts into account and emerging economies like India and China can go up before settling down at the 2 tonne-mark by 2050.
Developing countries, which started on industrialisation path in recent decades, contend that the developed world whose reckless excesses resulted in global warming should start cutting carbon emissions first.
In the last round of negotiations held at Warsaw last month, a group of 77 countries walked out asking the rich nations to immediately start supporting the developing countries facing "loss and damage" due to global warming. India has backed this stand.