In recent years, grain shortages have been exacerbated each year by droughts and other extreme weather conditions around the world, as well as delayed action to address population growth in developing countries. Meanwhile, grain producers in developing countries have switched to producing grain for livestock for the highly profitable food importing industrialised countries, and some importing countries are under-exploiting their abundant resources, relying on imports for 70-90% of their grain.

In the past, the World Bank invested heavily in large-scale livestock projects in developing countries, but has changed course. The reason is that "poor people are excluded, environmental destruction is progressing, and there is a danger that the safety and security of food in the world will be threatened."

The amount of water used for 1 kg of beef can produce 2,000 kg of grain.

・1 liter of water is needed to produce 1 kg of grain

・2,000 liters of water is required to produce 1 kg of beef

Bamboo grows quickly and its advantage as a grass substitute is that it grows faster than other trees because it has 'growth points' at each node, which stimulate growth through cell division and other processes. Note that the rate of growth slows down after two to three months above ground, and most of it ceases to grow after two years.

Cannabis plants are resistant to diseases and pests, so they do not require pesticides or chemical fertilizers, and can be grown with just a little water and organic fertilizer. Hemp seeds can be grown year-round in diverse regions of the world, and can be harvested in about 90 days after planting.