While the U.S. president declined to lay out his ideas for new accords before that meeting, he did call on Israel to implement agreements it reached with the Palestinian Authority in last year's Wye River accord.
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In addition, the greater variation of jobs in the modern workforce has made it harder to implement collective agreements.
For some governments there is an issue just about having the capacity - the civil servants with the right skills for example - to implement complex agreements.
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.
They committed to work together this year toward a successful outcome in Durban and to implement the Cancun agreements, including on transparency, adaptation, technology, finance, and forest protection.
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There are several reasons why not, one being that Mr Netanyahu has already proposed this and been turned down by Mr Arafat, who insists that Israel first implement the lesser agreements already signed.
Asked why a deal to implement the September agreements had been reached now, South Sudanese Information Minister Barnaba Marial Benjamin told the BBC's Newsday programme it was thanks to the negotiating efforts of Mr Mbeki and the African Union.
"They've... agreed that actions should be taken immediately - or maybe as soon as possible - to implement all the existing agreements unconditionally, " Mr Mbeki said.
Critics say that the agreements to implement a range of economic measures, including a tax cut and increased spending on roads, will create some jobs but provide little relief for most people.
Pre-Sal Petroleo would also run a new contract system that allows the state to implement production-sharing agreements that would direct more of the oil windfall to the state than to the oil companies whenever the price of oil goes up.
For his part, Mr Kiir said that he and Mr Bashir had agreed to implement all co-operation agreements.
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The United Nations will do its utmost to help Member States along this path, and is fully committed to supporting countries as they implement both existing and future climate agreements.
Plus, U.S. law stipulates that the United States can only demand that countries implement their own labor laws, whereas Democrats want the agreements to include what they call "core International Labor Organization standards" in the texts themselves.
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They also want what amounts to renegotiation of earlier agreements which they say have not delivered the expected benefits and are onerous to implement.
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