Increasing food supplies without damaging the environment is a challenge. Permaculture is farming in a sustainable and self-sufficient manner.
Organic farming uses natural methods to grow foods. This means using organic fertilisers and pesticides, such as animal slurry and natural predators and no artificial fertilisers or pesticides. Yields from organic crops are initially low, but they increase over time until they are in line with inorganic crops. Organic farming is environmentally sustainable because it doesn't pollute the environment.
Urban farming involves growing food using space in and around cities. Urbanisation has led to a reduction in farmland and so urban farming helps to alleviate this problem. Urban farming plots can produce more food than equivalent areas of farmland. It also helps to reduce food miles, which is better for the environment.
Modern fishing techniques use large nets. This often wipes out whole fish populations and many fish are trapped by accident. These are called bycatches. Sustainable fishing involves catching fewer fish. Better net designs and a return to traditional fishing methods are examples of sustainable fishing.
Meat production is resource-heavy. 6.5 kg of grain and over 13,000 litres of water are needed to rear every kilogram of beef. Feeding grain to cattle reduces the time it takes them to grow, but means there is less grain for people to eat. Sustainable meat production involves using grass as animal feed.
In the past, people ate food that was in season, eg cabbages during the winter and salad crops during the summer. Food is now available out of season thanks to heated greenhouses to produce it in the UK and cold storage to transport it to the UK. Seasonal food consumption reduces food miles and electricity use.
Developed nations waste a lot of food. Buying only the food that is needed is more sustainable as there is more food left to feed others.