Treeflights.com, which offers the service, it’s a “self-imposed green tax-something altruistic for the planet.”It is just one beneficiary of a growing environmental sub industry known as “Carbon offsetting.” Typically, one of this new breed of companies first calculates the amount of greenhouse gases This is take tree planting to suck upCO2 from the atmosphere. In addition, customers then voluntarily pay that firm to invest in projects that will cut carbon emissions by an equal amount.