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How much energy does it take to have a good and healthy life?A new Stanford University study has found the answer. Comparing energy use and quality of life across 140 coun- tries,researchers found that the magic number is 75 gigajoules (十亿焦耳)a year,or less.Americans use284 gigajoules a year per person,nearly four times that much energy,according to the new study.Globally,around 759 million people lived without e- lectricity and 2.6 billion without clean cooking fuel in 2019,ac- cording to the World Bank.But researchers also found that there is already enough energy used to get everyone on the planet over that amount,if it were shared equally.Based on current global energy consumption,there are 79 gigajoules used for each person