There are a plenty of reason why tree planting is important. For instance, trees:

  • tie carbon (1/5 of CO2 is tied by world forests)
  • filter pollution from the air
  • help recycle water
  • prevent soil loss
  • create shade
  • give shelter from wind and rain or reduce the effect of tsunamis
  • provide homes for animals
  • make food for humans and wildlife
  • provide an interesting, soothing, learning environment for children and your community

100 Million Trees by 2017

We, schools in the ENO Programme, aim to plant 100 Million Trees by 2017. This commitment was given in Rio+20 Summit and highlighted there. BBC's environmental correspondent said that out of 700 commitments, it was "the most dynamic-sounding pledge on the register". It is, but here are other numbers of how much 100 million trees would tie carbon:

If those trees would stay 100 years and grow to 30 metres we can calculate (optimistic) the amount of carbon like this: 

Volume PPA 1 m^2 x 30 m / 3 = 10 m^3, biomass 6 tons, and 3 tons carbon. As the value of a carbon ton is 10USD, those trees would then tie 300 million tons of carbon and the value of carbon would be 3 billion USD.

A more realistic estimation could be 1/10 of that including the loss of trees. And one cannot estimate the value of  a carbon ton in a long run.
 But we will certainly make a difference, schools and children around the world!