Conservation is related to Nature. you are likely to find System in/at/on Nature. 
Conspiracy is a type of Agreement. Conspiracy is a synonym of Scheme. Scheme is a synonym of Plot. Plot is related to Plan. 
Conservation <--RelatedTo--> Nature <--AtLocation-- System 
Agreement <--IsA-- Conspiracy <--Synonym--> Scheme <--Synonym--> Plot <--RelatedTo--> Plan 