In the same journal article is presented another way in which producers and conservationists are looking towards the future. Circulation of plant nutrients can be a vital part for conserving the future. An example of this would be the use of animal manure. This process has been used for quite some time now, but the future is looking towards ways to handle and conserve nutrients within manure for a longer time. But besides animal waste, food and urban waste are also being looked towards as a way to use growth within CA (Kirchmann & Thorvaldsson 2000). Turning these products from waste to being used to grow crops and improve yields is something that would be beneficial for conservationists and producers.