terrain damage

I always found it odd that all land Units can move freely in Desert and Tundra/Snow Tiles, and that without suffering any Consequences. I mean, Desert and Tundra/Snow are really trying Terrains if you're not used to that Climate. And same thing counts also for Jungle/Rainforest. So we can't...

Where do i modify Terrain Damages? They're way too high, and even surrounding tiles deal out similar full damage from adjacent tiles! Do AI units get damages as well? For example, i want Scouts to receive less damages than other units. The CIV4TerrainInfos.xml file lists Desert & Tundra at...