[President_Elect_Shang]

First you need "Cultural Studies" lvl one, then you need "Environmental Sciences" level one, then for every level you attain you gain a one percent increase to your resistance of environments. So to see any real benefit you need to get up there in levels first. However, if you want them to have more babies why don't you do "Leisure Services Achievement"? It's only effect is to increase reproduction. Or you can build "Medical Lab"'s on your planets which increase reproduction too. Depending on your tech area access you can also do "Gestation Vats". Finally you have the option to build "Genetic Recoding Lab" which will give the biggest bang per level of tech area.