To be successful, a large-scale composting program
must be located carefully and odors must be controlled,
because people do not want to live near a giant compost
pile or plant. Some cities in Canada and many
European Union countries compost more than 85% of
their biodegradable wastes in centralized community
facilities. Sometimes composting takes place in huge
indoor buildings. In the Canadian city of Edmonton,
Alberta, an indoor composting facility the size of eight
football fields composts 50% of the city’s organic solid
waste. Composting programs must also exclude toxic
materials that can contaminate the compost and make
it unsafe for use as fertilizer.