The FCC rules that govern the delivery methods telemarketing and advertisements. Telemarketing means the initiation of a telephone call or message for the purpose of encouraging the purchase or rental of, or investment in, property, goods, or services, which is transmitted to any person.
Anaerobic manure digesters (also called methane digesters) collect manure and convert the energy stored in its organic matter into methane, which is used to produce energy. 651-201-6000
The definition of manure is  animal excrement that is used to fertilize. Animal excrement that you spread around in your garden to fertilize the soil so the garden will grow better is an example of manure.