Towards a Trillion Trees

I'm a big fan of trees, especially for helping to address the world's environmental problems. So this sounds like a jolly good wheeze:

The Nobel peace laureate Wangari Maathai launched a campaign today to plant a billion trees next year - 32 every second - to highlight the need to tackle global warming.

Mind you, in the light of the fact that

Over the past decade 130m hectares of trees have been destroyed, according to the UN. Reforesting such an area would require 140bn trees to be planted.

I think we should be more ambitious: how about a trillion trees? Has a nice ring to it, don't you think?