The official in charge of global climate negotiations says between 80 and 100 countries are expected to sign the landmark agreement to tackle climate change reached in Paris in December, at a ceremony at United Nations headquarters on April 22.
 
Segolene Royal, French environment minister and newly-appointed president of UN-led climate negotiations, says that more than 30 heads of state and government has already said they would attend the signing event.
 
She says invitations signed by UN secretary general, Ban Ki-moon, French President, Francois Hollande, and herself are also being sent again to all world leaders.
 
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