In the future, on earth, other planets, or in space, cereal and meat foods must remain necessary for human living and survival. Applying the genetic elements we identified, emerging to adapt to historical geographic changes, will provide new challenges in constructing ideal crops for future extreme environments. The C₄ rice project was well-known but not completed. We will also employ ancestorial genetic elements in tropic Poaceae plants to construct C₄ rice with a high photosynthesis rate.