The goal "is a further sign of the breathtaking momentum witnessed this year on the challenge for this generation – climate change," said Achim Steiner, executive director of the UN Environment Programme.
The Billion Tree Campaign was launched at UNEP headquarters in Nairobi last November.
Half of all those who participated were private citizens or households planting one to three trees, said UNEP, while another 13% were planted by the private sector.
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By newpn2000