NASA Data: Is there farm land on objects near Earth?
7/15/2006 Earth Moon Mars Venus
Average surface temperature, degrees K 288 275 210 737
Average surface temperature, degrees C 15 2 (63) 464
Average surface temperature, degrees F 59 35 (81) 867
Diurnal temperature range, degrees F 18 540 104 0
Average surface pressure, bars 1.014 3x10-15 0.00636 92.00
Oxygen in atmosphere, % 20.95 0.00 0.13 0.00
Carbon dioxide in atmosphere, % 0.035 0.00 95.32 96.50
Nitrogen in atmosphere, % 78.08 0.00 2.70 3.50
Water vapor, ppm 10,000 0 210 20
Surface gravity, m/s2 9.798 1.62 3.71 8.87
Solar irradiance, W/m2 1,367.60 1,367.60 589.20 2,613.90
Notes:
1. Source: http://nssdc.gsfc.nasa.gov/planetary/factsheet on 7/15/06.
2. Only Earth has a temperature, atmosphere, and water suitable for plant and animal
     life as we know it.  Some bacteria might be able to survive on Mars.
3. Since we don't know how to create and maintain a stable ecosystem, we 
    should plan for a smaller, stable population of humans on Earth.