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Dozens of nations signed an agreement nearly 30 years ago to stop the expansion of a massive hole in Earth's ozone layer. Today, thanks to the Montreal Protocol, the hole in the ozone layer has shrunk as countries reduced,...

At the COP 21 conference in Paris this week, US Secretary of State John Kerry demanded that any climate agreement include a legally binding "transparency system" to keep world governments accountable and show that the participating...

Providing the accord is finalised in June, here is who stands to benefit most … and who least

Secret parameters would be included in any agreement over the future of Iran’s nuclear programme, say diplomats, as Lausanne summit enters eighth day

US says prospects of deal on the final day are ‘50-50’ as talks remain stuck on Tehran’s demand for immediate end to sanctions if nuclear programme is halted

US secretary of state dismisses UK counterpart’s remark that Monday deadline for reaching deal will have to be extendedThe US secretary of state, John Kerry, arrived at nuclear talks with Iran in Vienna on Thursday, insisting...

Presence of US secretary of state likely to see final push towards an agreement in runup to Monday deadlineThe US secretary of state is due to arrive in Vienna on Thursday night as international nuclear negotiations with...

Iranian president says Tehran has made utmost efforts and adjustments to its demands as deadline for nuclear pact nearsIrans president, Hassan Rouhani, has asked the US to stop making excessive demands in the negotiations...

For Hassan Rouhani and his team, the task is perhaps even more urgent than for Barack ObamaNext month, Hassan Rouhani will mark his first anniversary in Tehran's Pasteur Street, where the offices of the Iranian president...

"People all across the country are concerned about this pipeline because it’s going to pollute the water. Because it’s going set off catastrophic climate change. Because it’s a security risk," Whit Jones, campaign director...

U.S. Secretary of State John Kerry has said that climate change is "perhaps the world's most fearsome weapon of mass destruction." His statement has been described a strong counter to those in the American government who...

Hundreds gathered on a chilly night at Lafayette Square across from the White House to tell President Obama to keep his climate promise and stand up to the fossil fuel industry by rejecting the dirty tar sands oil pipeline...

  A long-awaited report from the US State Department claims that the proposed Keystone XL pipeline is unlikely to add to global greenhouse gasses in any significant way -- not because tapping into Canadian oil sands...

Final decision rests with Barack Obama but review says no 'significant' effect on carbon emissions is likely

IAEA granted permission to enter long-unseen facilities as Tehran seeks to show co-operation after failure of Geneva talksIran has agreed to allow inspectors from the International Atomic Energy Agency to enter long-unseen...