This is an addon for TerraFirmaCraft, that does simple things; change the entire world to one continuous desert and make the world devoid of life. Oceans are removed, and the only way to get water are from hot springs or perhaps other subsurface sources. For proper survivability you'll likely have to customize your game with other mods, that add alternative methods for acquiring sticks, wood, food and the like.
This addon works very well with my other addons TFC Improved Badlands and TFC Weather, as they respectively add sand dune terrain and layered sand blocks, both working in harmony to make the terrain smoother, easier to traverse, and more aesthetic. This also fits the desert theme very well. TFC Weather also adds sand storms to TFC, which might be of interest to some -- this is of course configurable.