A small 50kW DC roof mounted solar array will produce an estimated 87,041kWh which would offset $7,000 in energy costs and 96,267lbs of CO2 emissions in the first year. This is the same amount of CO2 that would be offset by 498 fully matured trees*.
Over a period of 25 years the same 50kW array would produce an estimated 2,000,000kWh which would save $200,000 in energy costs and would offset over 2.2 Million pounds of CO2 emissions.
*2010 EPA study shows 1kWh of electricity produced from fossil fuel plants creates 1.106lbs of CO2 emissions. The Department of Energy calculates a 30 year old mature pine tree absorbs 193lbs of CO2 per year.