Wireless sensor network is a fast emerging field and gain a lot of attention from the research groups. Energy efficiency is the main and a crucial factor in WSN because sensor nodes have battery support. To increase network lifetime, energy awareness is an essential consideration and routing is the main factor which affects the energy consumption. For this problem cross layer approach has been proven to be an efficient technique than traditional approaches. Thus, paper presents a survey on Cross Layer energy efficient routing solutions proposed so far and comparative analysis for the various cross layer routing. The three main categories for comparison explored in this paper are a type of routing protocol, cross layering used and technology used at each layer. Open issues in proposed routing methods using cross-layer are also discussed.