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The status of bioenergy has been legally confirmed by various countries. 2008-1-8 11:40:52 On December 18, 2007, the U.S. House of Representatives passed the Energy Law Amendment. The new energy law encourages the development of biofuel ethanol and requires the use of biofuel ethanol to reach 36 billion gallons by 2022, which means that the use will increase more than five times in the next fifteen years. Brazil * * has made mandatory provisions on the use of bioenergy: 20% ethanol must be added to all gasoline fuels ； In addition, it is also stipulated that from January 1, 2008, all gas stations in Brazil will stop supplying traditional ordinary diesel, and all diesel sold must contain 2% biodiesel. Brazil * * It also plans to increase the proportion of biodiesel to 5% next year, achieving the original target of 2013 ahead of schedule. China * * The National Development and Reform Commission has also made overall arrangements for the development of the biofuel industry. * * The National Development and Reform Commission proposed in the medium and long-term development plan for renewable energy: In 2010, biofuels replaced 2 million tons of oil annually, and by 2020, biofuels will replace 10 million tons of oil annually. Countries attach great importance to biomass energy, making energy crops derived from it become very popular in the international market. The shortage of biomass energy has driven up the price of agricultural products. The rise of biomass energy has led to the expansion of its planting area, resulting in a relative decrease in the planting of some grains, resulting in a sharp rise in international grain prices. The rise in food prices has in turn led to an increase in demand for agriculture-related pesticides, fertilizers and other fields. Moreover, biomass energy crops such as corn, soybeans, sugar cane, etc. are also important food crops themselves.