[Suicide Junkie]

I figure that planet conditions range from Deadly(0%) to Optimal (100%).
Since there are about 6 words for the different levels of conditions, they would be separated by 20% each

A conditions improvement plant (level 3) adds 3% every 10 turns (1 year).
At that rate, you need 70 turns to ensure a rating upgrade.

The easiest way to improve the improvement rate is to build multiple plants, since they DO stack.

Of course, you could always mod them to be much more powerful.

[ 15 April 2002: Message edited by: Suicide Junkie ]