Environmental concerns are the dominant macro-level justification for sustainable procurement, born out of the growing 21st century consensus that humanity is placing excessive demands on available resources through unsustainable but well-established consumption patterns. Sustainable procurement aims to promote conservation and responsible management of resources by using renewable or recycled materials wherever possible and reducing waste. Sustainable procurement also involves looking at production practices and making sure there are not any negative impacts to the environment such as pollution, biodiversity loss or habitat disruption.