Energy Usage: Energy is an essential resource across the entire food production cycle, with estimates showing an average of 7-10 calories of input being required in the production of one calorie of food.
出自-2013年12月阅读原文
This varies dramatically depending on crop, from three calories for plant crops to 35 calories in the production of beef.
出自-2013年12月阅读原文
Some iced coffees have as many calories as a hot dinner.
出自-2010年12月听力原文