For more information: The Green Belt Movement Nobel Women's Initiative.
Obama came to the White House in 2009 with a green "dream team" including Nobel laureate, Steve Chu, as energy secretary.
Perhaps the most eminent critic of organic farming is Norman Borlaug, the father of the "green revolution", winner of the Nobel peace prize and an outspoken advocate of the use of synthetic fertilisers to increase crop yields.
The out campaign has attracted figures from all the major parties, including the Green peer Jenny Jones, and the joint Nobel peace winner and former Northern Ireland first minister Lord Trimble.
Among the signers are two Nobel laureates, geneticist James Watson and green revolution pioneer Norman Borlaug.
The group that includes Chalfie, Osamu Shimomura, and Roger Tsien are being honored for their Nobel Prize-winning work on green florescent protein (GFP), which comes from bioluminescent jellyfish.
The alliance provides Mr. Gore an additional pulpit for his advocacy of environmental causes, but also gives the Nobel laureate an opportunity to nurture green businesses.
He returned to the green room again - and this time the Nobel prizewinner took the gift with grace, listened as O'Cain recited the poem, and said: "I liked the poem, I love the picture".
So far, 45m have been planted in Kenya alone under her Green Belt Movement, for which she received the Nobel prize, and 7bn worldwide in the UN programme she patronised.
