France's Hollande signs Paris climate agreement

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French president, the first to sign, said the 28-nation EU should now 'lead by example' and ratify the Paris deal before the end of the year.

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China and the United States, the world's top greenhouse gas emitters, on Friday (Apr 22) signed the Paris climate deal at a UN ceremony attended by a record 171 countries, boosting hopes of quick action on combating global warming, reports Channel NewsAsia.