Manure firing with no requirement for a kiln has made this zero technology approach available anywhere it is needed
这句话中anywhere it is needed 是状语从句吗?... has made ... available anywhere it is needed.
前面没什么问题,主要是后面。我的理解是:available是宾补,anywhere it is needed是状语从句。但是anywhere和it之间为什么不需要连接词that?