food crops for energy production by making biodiesel and bioethanol

 The main food crops harvested for energy are sugar-producing crops (e.g. sugarcane), starch-producing crops (e.g. corn) and oil-producing crops (e.g. rapeseed).[7] Sugarcane is a perennial crop which grows naturally after every crop without replanting, while corn and rapeseed are annual crops. Sugar- and starch-producing crops are used to make bioethanol, and oil-producing crops are used to make biodiesel. USA is the largest producer of bioethanol, while EU is the largest producer of biodiesel.[8] The energy content in the global production of bioethanol and biodiesel is 2.2 and 1.5 EJ per year, respectively.[9] Biofuel from food crops harvested for energy is also called "first-generation" or "traditional" biofuel, and has relatively low emission savings.

Perennial energy crops are seen as the "[...] preferred category of crops for energy production [...]" because of high yields and "[...] a (much) better ecological profile than annual crops [...]".[11] However, the commercial production of these crops is currently not significant on a global scale.[x] In the UK, the government declared in 2021 that land areas set aside for perennial energy crops and short rotation forestry will increase from 10.000 up to 704.000 hectares.[y] IRENA's global estimate for 2030 is 33–39 EJ, which is considered conservative.[12] The technical global energy potential for perennial energy crops alone has been estimated to 300 EJ annually.[z]

REf: https://en.wikipedia.org/wiki/Biomass

1 Exajoule [EJ] = 277 777 777