Sustainable consumption refers to consumption that can meet the needs of contemporary people's consumption and development without posing harm to the ability of future generations to meet their consumption and development needs. According to the above definition, which of the following is sustainable consumption? ['A rich man asks his children to make their own money to pay for food, clothing, and shelter.', 'The inside of the tomb of a famous emperor has not been excavated, visitors can browse the surrounding scenery.', 'Lack of water resources in a country, using "desalination" technology to increase the amount of freshwater.', 'Some mobile phone manufacturers encourage consumers to change one phone per year.']