Linked from
The 14 pages that link to CAM photosynthesis, each with the reason it gives.
DesertRelated: Nighttime gas exchange reduces water loss in some desert plants.
PineappleRelated: Pineapple uses this water-saving pathway, unusual among major fruit crops.
CaatingaRelated: Some Caatinga succulents use CAM to conserve water in hot, dry conditions.
OpuntiaRelated: Many Opuntia species use this pathway to reduce water loss in hot, dry environments.