1. Flight carbon dioxide emissions are based on 90 kg. of CO2 per passenger each hour, an 80 percent flight occupancy rate, and a radiative forcing factor of 2.
2. Each hectare of forest we restore soaks up an average of about 20 tons of carbon dioxide per year. Our cost per hectare varies, but averages around $2,000.
3. A single NASA space shuttle launch produces an estimated 28 tons of carbon dioxide.