There is a silver bullet, a single solution to all the world's major problems. Crime, global warming, economic inequality, obesity, the high cost of health care and college, obsessive consumerism, illegal immigration, meat eating and overpopulation all will easily become a thing of the past.
Bernie Sanders and Alexandria Ocasio-Cortez already know the answer. The silver bullet is socialism.
As a Fulbright professor in the People's Republic of China in 1985, I witnessed the solution firsthand.
People in China were amazingly healthy. Nearly everyone rode a bicycle, with obvious health benefits. Those who couldn't bicycle took the public bus. No single individual at my highly ranked university could afford a car. Cars were owned by work units and were used sparingly. The only traffic jams were caused by bicycles. Carbon emissions were correspondingly low. There were few sources of global warming from nasty internal combustion vehicles in China in 1985.
Consumption of electricity was also minimal. People cannot waste electricity if they cannot afford electricity.
China in 1985 likewise solved the problem of the high cost of going to university. Universities actually paid students to attend. In those days, starting professors earned about $50 per month and students earned $15. Housing was free. Students were housed six to a tiny room, sleeping in three bunk beds. The bathroom was down the hall, where students could take cold-water showers.
China's socialism led to a dramatic conservation of the Earth's precious water and energy.
Socialist China solved the obesity problem, too. I can report that I never saw an obese student out of the thousands who attended my university — or even among the general public. The university, via the state, subsidized the main dietary staples, cabbage and rice. Meat was a luxury. Students and staff were given ration coupons for the subsidized cabbage and rice. Many people were vegan, by necessity.