Editing RTT Worldgen (section)

===== Dwarfs, Terrestrials, Helians, and Jovians =====
For each such world, add up all the factors which apply:
*''Dry World'' – Hydro 0: '''-1'''
*''Extreme Environment'' – Size D+; or Atmos C-G; or Hydro F: '''-2'''
*''Flare Star'' – M-Ve star: '''-1d3'''
*''Habitable World'' – Size 1-B, Atmos 2-9, and Hydro 0-B: further detail needed
**''Garden World'' – Size 5-A, Atmos 4-9, and Hydro 4-8: '''+5'''
**''Water World'' – Hydro A-B: '''+3'''
**''Poor World'' – Atmos 2-6, and Hydro 0-3: '''+2'''
**Otherwise: '''+4'''
*''High Gravity'' – Size A+ and Atmos F-: '''-1'''
::''Note: Yes, normal Jovians don't count as "high gravity", as one doesn't live on the surface.''
*''Lifebelt'' – Inner Zone orbit: further detail needed
**Any giant, brown dwarf, or white dwarf: '''+0'''
**M-V star: '''+1'''
**Any other dwarf or subgiant: '''+2'''
*''Tiny World'' – Size 0: '''-1'''
*''T-Prime Atmosphere'' – Atmos 6 or 8: '''+1'''

====== Terraforming ======
At Tech Level 10+, any Inner Zone world with Size 1-B and Atmosphere 1-D, and ''not'' Hydro F, may be terraformed. For each such world, take (TL+Settlement-15) OR (TL+1d6-15) points, whichever is more. You may add these points to or subtract them from the world's Atmosphere, Hydrosphere, or Biosphere codes, in order to improve their Desirability ratings. 

If you want to introduce Earthly bioforms to a world with alternative biochemistry, you first have to exterminate the existing life by reducing the Biosphere to 2 or less, ''then'' increase it.

Other suggested limits on terraforming:
:Worlds with Hydro F cannot be terraformed, period.
:Worlds with Hydro B cannot be reduced below Hydro B. There's just too much ocean.
:Worlds with Atmos B or C and Hydro 2+ cannot be reduced below Atmos B, unless you first reduce them to Hydro 1 or less. After converting the atmosphere, you may add water seas, increasing Hydro normally.
:Worlds with native populations cannot be terraformed without genocide – and the natives will resist. Treat population as another code to modify, and reduce it to 1 or less before continuing.
:Roll to see if there's an outpost first; if there is, terraforming may proceed. Then roll to see if there's a colony after terraforming.