Why aren't we on this list?

And half were done by private citizens. Half. (my bold):

Initiative by the Green Belt Movement, the Prince of Monaco, UNEP and ICRAF to Catalyze the Planting of one Billion Trees Reaches Goal in Advance of Next Climate Convention Conference.

[snip]

Nobel Peace Prize winner Wangari Maathai, the Kenyan Green Belt Movement founder and Patron of the campaign, said: "I am elated beyond words at the global interest and action that was motivated by the Billion Tree Campaign. I knew we had it within us as a human family to rise up! We called you to action almost exactly a year ago and you responded beyond our dreams. Thank you very much! Now we must keep the pressure on and continue the good work for the planet. Plant another tree today in celebration!"

The enthusiasm of individuals to make a difference is underlined by figures collected by UNEP which indicate that half of all those who planted are often private citizens or households planting one to three trees. Significantly, another 13 per cent have been planted by the private sector, which participated actively in the initiative.

ICRAF Director General Dennis Garrity said: "The World Agroforestry Centre is very proud that the ambitious goal of the Billion Tree Campaign has been attained. This milestone shows clearly that the global community has the spirit and the substance to unite in achieving ambitious targets to create a better environment for all. We look forward to working with UNEP and so many other organizations in setting and achieving even greater stretch goals for a more 'bountreeful' world in the coming years."

The news comes as thousands of delegates across the world are ready to arrive on the Indonesian island of Bali for the next and most crucial round of global warming negotiations under the UN Framework Convention on Climate Change (UNFCCC).

The Intergovernmental Panel on Climate Change, jointly established by UNEP and the World Meteorological Organization, has in 2007 concluded that climate change is happening; the global impacts are likely to be in many cases devastating but cost effective solutions are available now to counter the worst.

[snip]

The totals of trees planted are still being collated with the numbers rising almost daily. But the top-ranking countries appear to be Ethiopia, over 700 million trees planted; Mexico, 217 million trees; Turkey, 150 million; Kenya, 100 million; Cuba, 96.5 million; Rwanda, 50 million; Republic of Korea, 43 million; Tunisia, 21 million; Morocco, 20 million; Myanmar, 20 million and Brazil, 16 million. The Green Belt Movement alone planted 4.7 million trees, double the number of trees it had initially pledged.

Thank you, Nobel Peace laureate Prof Wangari Maathai for your good work!