Speaking earlier at the summit, UN Secretary General Ban Ki-moon said he believed an agreement was in sight, with recent moves by some countries a positive step to cutting emissions.
Obama's appeal joins an international call, including United Nations chief Ban Ki-moon, for the two nations to end their fighting.
United Nations Secretary-General Ban Ki-moon, together with his wife, Madam Ban Soon-taek, arrived for an official visit to Argentina on Monday, 13 June.
Ban Ki-moon has agreed to set up an international scientific advisory board to provide him with guidance on science-related issues, and enable him to provide advice to UN member states on such issues.
Sri Lanka undertook its LLRC inquiry partly because an investigation was being launched by the UN secretary-general, Ban Ki-moon.
Secretary-General Ban Ki-moon has urged "immediate and unfettered access" for an expanded investigation.
Ban Ki-Moon, United Nations Secretary-General, tasked Irina Bokova to convene an Ad Hoc Group to advise him on the science-related recommendations of the Report.
In May, United Nations Secretary General Ban Ki-moon appointed him as the United Nations' special envoy to Haiti in an effort to refocus international attention on the Caribbean country's deep economic problems and environmental decay.
Ki-moon said that, from the earliest planning stages of a peacekeeping operation, an end point must be envisaged at which the countries concerned could implement peace agreements and achieve at least the minimum level of sustainable stability, among other results.
United Nations Secretary-General Ban Ki-moon arrived in Kuwait City early on the morning of Wednesday, 28 March, after an overnight flight from Seoul via Dubai.
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