The European Union and environmentalists called for urgent action on climate change at UN-led talks in Germany today, but the United States said it was too early for substantial steps on a global warming pact.
A further sign of US unwillingness to move swiftly came in a draft climate statement by the group of eight leading rich nations - for release at a G8 meet next month - suggesting Washington was not ready to propose emissions targets.
Both today's meeting in Bonn and the upcoming G8 talks are meant to feed into UN discussions to get a global climate deal by the end of next year in Copenhagen, to come into force after the first round of the Kyoto Protocol expires in 2012.
The present Kyoto pact caps the planet-warming greenhouse gases of some 37 industrialised countries, but not those of the world's top two emitters -- the United States and China.
"There's a huge urgency here," Artur Runge-Metzger, the European Union's head of climate negotiation, told Reuters. "Rather little has happened in the past six months."
By contrast, US climate negotiator Harlan Watson, speaking to senior officials from more than 160 countries gathered in Bonn, counselled patience.
"We do not see negotiating substantive outcomes to conclusion at this stage, as the Bali Action Plan is a two-year plan of work," said Watson, referring to the launch of climate talks last December in Bali, Indonesia.
"Activity related to climate change is increasingly global, as are the means to address it," Watson added, alluding to the growing carbon emissions of emerging economies such as China.
Greenpeace International's Bill Hare said the Bonn talks, which end on June 13, were heading into trouble unless countries offered "quite concrete ideas".
He referred to climate science suggesting global emissions must peak in the next 10 years to have the best chance to avoid dangerous warming.
The Bonn meeting, the second of eight planned, UN-run sessions to get a deal, coincide with criticism of policies to cut greenhouse gases - especially support for biofuels, as well as carbon taxes and emissions trading - which are adding to soaring energy and food prices.