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Trump says summit with North Korea's Kim Jong-un may be delayed

Trump says summit with North Korea's Kim Jong-un may be delayed

World
Media playback is unsupported on your device US President Donald Trump has said there is a "very substantial chance" a historic summit with North Korea's Kim Jong-un next month may not happen.He said the North must meet conditions for the summit to go ahead though if it did not, it might happen "later".He was speaking as he received South Korea's President Moon Jae-in at the White House.The North has said it may cancel the summit if the US insists on it giving up nuclear weapons unilaterally.Mr Trump did not say what conditions the US had set for the summit but, asked by a reporter about the North's arsenal, he said "denuclearisation must take place".The 12 June summit is due to take place in Singapore. It follows a summit between the two Kore...
Ozone layer recovery could be delayed by 30 years

Ozone layer recovery could be delayed by 30 years

Science
Rising global emissions of some chlorine-containing chemicals could slow the progress made in healing the ozone layer.A study found the substances, widely used for paint stripping and in the manufacture of PVC, are increasing much faster than previously thought.Mainly produced in China, these compounds are not currently regulated. Experts say their continued use could set back the closing of the ozone hole by up to 30 years. Scientists reported last year that they had detected the first clear evidence that the thinning of the protective ozone layer was diminishing. Media playback is unsupported on your deviceThe Montreal Protocol, which was signed 30 years ago, was the key to this progress. It has progressively helped governments phase out the chlorofluorocarbons and the hydrochlorofluoro...