The inorganic molecule required by green plants for the process of photosynthesis is carbon dioxide (CO2).

Here's why:

* Photosynthesis: This process uses sunlight, water, and carbon dioxide to produce glucose (a sugar) and oxygen.

* CO2 as the carbon source: Carbon dioxide provides the carbon atoms that are incorporated into glucose. This is the main building block of the organic molecules plants need for growth and energy.

Let me know if you'd like to know more about the steps of photosynthesis!