Within our own operations and joint ventures, we focus activity that have the greatest potential impact on the environment. We aim to reduce energy use, our carbon footprint, water use and waste to landfill. In 2016, we achieved a leadership position of A- in the CDP.
Our main environmental impacts are energy and carbon, water and waste. We consider our impacts principally within our own operations, but are increasingly focusing on the sustainability of our agricultural supply chain, particularly our principal raw material, corn. Our environmental performance in 2017 showed positive progress in our primary carbon footprint, waste to landfill and water usage. Our energy use remained largely unchanged.
Each year we publish in our Annual Report our key performance indicators and how we have performed.