If you can plant one tree in your residence per month it is twelve tree per year and if you can encourage only 5 friends to do the same then there will be 72 trees planted per year from your locality.If the same can be repeated by 4 friends of your 5 friends then the total number of trees planted will become 312 in only one year.That means your locality will absorb 14976 pound of carbon per year and will release as much oxygen to support 624 human being .