Copy the XML folder to your Custom Assets directory.

Go to C:\Program Files\Firaxis Games\Sid Meier's Civilization 4

Or where you have installed Civ4.  There is a link to a folder named _Civ4CustomAssets

This will generally take you to

C:\Documents and Settings\Administrator\My Documents\My Games\Sid Meier's Civilization 4\CustomAssets

Replace the XML folder there.

This does not change the original game files, this folder is meant for modifications.

Three files are changed:

XML\GlobalDefines.XML
XML\Buildings\CIV4BuildingInfos.XML
XML\Gameinfo\Civ4ProjectInfo.XML


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GlobalDefines.XML has been edited to remove global warming. 
The string changed within the file is:

<DefineName>GLOBAL_WARMING_PROB</DefineName>
<iDefineIntVal>0</iDefineIntVal>

Original setting was 20, I set it to 0.

-------------------------------------------------

CIV4BuildingInfos.XML has been edited to reduce the effect of Bomb Shelters.
The string changed within the file is:

<BuildingClass>BUILDINGCLASS_BOMB_SHELTER</BuildingClass>
<iNukeModifier>-25</iNukeModifier>

Original setting was -75, I set it to -25.

------------------------------------------------

Civ4ProjectInfo.XML has been edited to reduce the effect of the SDI project.
The string changed within the file is:

<Type>PROJECT_SDI</Type>
<iNukeInterception>33</iNukeInterception>


Original setting was 75, I set it to 33.

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