Please tell me that I made a horrible math error.

A. Amount of CO2

`Annual CO2 Emissions (all sources) 32,000,000,000 tons / year Airborn Fraction (not absorbed into existing carbon sinks) 43% Annual accumulation of CO2 in the atmosphere 13,760,000,000 tons / year `

B. Amount of forest required for CO2 capture

`Amount of CO2 that can be captured by one mature tree per year 50 lbs / year Number of trees per acre (tree plantation) 1,000 trees / acre 640,000 trees /square mile Amount of CO2 per acre of forest captured annually 50,000 lbs / year per acre 25 tons / year per acre 16,000 tons / year per square mile Square miles of forest needed to capture excess CO2 860,000 square miles (approximately 900 x 900 miles) Comparisons: Australian Outback 2,500,000 square miles Gobi Desert 500,000 square miles Sahara Desert 3,552,000 square miles Total number of trees 550,400,000,000 trees `

C. Water requirements

`Amount of water needed per tree (mature oak) 50 gallons / day 18,250 gallons / year 0.056 acre*foot /year Total amount of water needed for CO2 capture trees 30,822,400,000 acre*foot /year 84,444,932 acre*feet/day Comparisons: Lake Superior 9,799,680,000 acre*foot Lake Baikal (Siberia) 19,261,440,000 acre*foot Irrigation efficiency (advanced Isreali drip irrigation techniques) 95% Amount of water to be desalinated 32,444,631,579 acre*foot /year Comparisons: Amount of water consumed by New York City annually 1,120,185 acre*foot /year `

D. Capital Costs

`Cost per acre of desert (typical Nevada desert land prices) $200 per acre Total land costs $110,080,000,000 Cost of planting one acre of trees (seedlings) $500 per acre Total planting costs $275,200,000,000 Cost of 250 MGD desalination plants (Ras Al Khair Plant) $7,200,000,000 each Number of 250 MGD desalination plants 110,098 each (equivalent to 767 acre*feet per day) Total cost of desalination plants $792,703,398,760,515 Amount of concrete pipe water mains 2,376,000,000 feet (assume 1,000 each 12 ft dia. concrete pipelines, ave 450 miles) Unit cost of concrete pipe (assume 8 ft lengths) $300 / foot Total costs of water mains $712,800,000,000 Total capital costs (with 10% added for misc.) $873,181,626,636,567 Comparisons: USN aircraft carrier strike group $30,000,000,000 International space station $150,000,000,000 `

E. Annual Operating costs

`Cost of desalination (large plant, $950 to $1,300 per acre* foot) $1,000 acre*foot $32,444,631,578,947 per year Pumping rate (assume 1,000 pipelines, each 450 miles long) 61,729 acre*foot / minute 18,711,000,000 gpm 18,711,000 gpm per water main Head Losses 82,244,903 feet (assume 12 ft dia. reinf. concrete pipes/tunnels) Cost of Pumping (engineeringtoolbox.com) $9,776,019 per hour (assume cost rate of $0.10 per kWh) $85,637,926,440 per year Total operating costs (with 10% added for misc) $35,783,296,455,926 Comparisons: World GDP (2014) $78,280,000,000,000 `