UN Secretary General Ban Ki-moon has criticised leaders of the G8 industrial nations for failing to make deeper commitments to combat climate change.
On Wednesday, the leaders, meeting in Italy, agreed to cut emissions by 80% by 2050, but Mr Ban said big cuts were needed sooner rather than later.
The leaders are set to meet their counterparts from emerging economies to discuss a new deal on global warming.
US President Barack Obama will chair the session, in the city of L'Aquila.
'Moral imperative'
Mr Ban said Wednesday's agreement was welcome, but the leaders needed to establish a strong and ambitious mid-term target for emissions cuts by 2020.
"This is politically and morally imperative and a historic responsibility for the leaders... for the future of humanity, even for the future of Planet Earth," he told the BBC.
Mr Ban said the leaders also had to come up with financial incentives for poorer countries to reduce pollution and aid to help them mitigate the effects of climate change.
President Obama will chair the Major Economies Forum meeting on Thursday afternoon.
The countries represented there account for some 80% of the emissions of gases that are blamed for global warming.
'Still time'
The BBC's diplomatic correspondent James Robbins, in L'Aquila, says the talks with India and China will be difficult.
China's president has headed home to deal with the ethnic violence in Xinjiang, so there are now questions whether his delegation will be more cautious.
Our correspondent adds that India is already complaining that the G8's long-term targets for 2050 are too long-term and that G8 countries are ducking interim targets for 2020 which would make their 40-year ambitions more credible.
But in a meeting with Brazilian President Luis Inacio Lula da Silva, Mr Obama said there was still time to close the gap between developed and developing nations before UN talks on a new climate change treaty in Copenhagen in December.
The summit host, Italian Prime Minister Silvio Berlusconi, has said a deal should be all-inclusive.
"It would not be productive if European countries, Japan, the United States and Canada accepted cuts that are economically damaging while more than five billion people in other countries carried on as before," he said.
The G8 summit began in L'Aquila on Wednesday, with the first day largely taken up with discussion of the fragile state of the global economy.
The leaders also issued a statement reaffirming that they were "deeply concerned" by Iran's nuclear programme and condemning North Korea's recent nuclear test and missile launches.
African leaders will join the summit on Friday to push for a new initiative to fund farming in the developing world and tackle global hunger.
On Wednesday, the leaders, meeting in Italy, agreed to cut emissions by 80% by 2050, but Mr Ban said big cuts were needed sooner rather than later.
The leaders are set to meet their counterparts from emerging economies to discuss a new deal on global warming.
US President Barack Obama will chair the session, in the city of L'Aquila.
'Moral imperative'
Mr Ban said Wednesday's agreement was welcome, but the leaders needed to establish a strong and ambitious mid-term target for emissions cuts by 2020.
"This is politically and morally imperative and a historic responsibility for the leaders... for the future of humanity, even for the future of Planet Earth," he told the BBC.
Mr Ban said the leaders also had to come up with financial incentives for poorer countries to reduce pollution and aid to help them mitigate the effects of climate change.
President Obama will chair the Major Economies Forum meeting on Thursday afternoon.
The countries represented there account for some 80% of the emissions of gases that are blamed for global warming.
'Still time'
The BBC's diplomatic correspondent James Robbins, in L'Aquila, says the talks with India and China will be difficult.
China's president has headed home to deal with the ethnic violence in Xinjiang, so there are now questions whether his delegation will be more cautious.
Our correspondent adds that India is already complaining that the G8's long-term targets for 2050 are too long-term and that G8 countries are ducking interim targets for 2020 which would make their 40-year ambitions more credible.
But in a meeting with Brazilian President Luis Inacio Lula da Silva, Mr Obama said there was still time to close the gap between developed and developing nations before UN talks on a new climate change treaty in Copenhagen in December.
The summit host, Italian Prime Minister Silvio Berlusconi, has said a deal should be all-inclusive.
"It would not be productive if European countries, Japan, the United States and Canada accepted cuts that are economically damaging while more than five billion people in other countries carried on as before," he said.
The G8 summit began in L'Aquila on Wednesday, with the first day largely taken up with discussion of the fragile state of the global economy.
The leaders also issued a statement reaffirming that they were "deeply concerned" by Iran's nuclear programme and condemning North Korea's recent nuclear test and missile launches.
African leaders will join the summit on Friday to push for a new initiative to fund farming in the developing world and tackle global hunger.
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