What an interesting question! To answer, let’s have a little science lesson.
All plants, including succulents, convert light to energy via photosynthesis. This is why you’ll see plants in rainforests and jungles become so large — they have access to more light, so they grow bigger.
Often a greenhouse that is located in an area that doesn’t get regular sunlight (due to cloudy/rainy weather or seasonal changes) will use various methods to aid their plants’ growth. They accomplish this with grow lights, and also by supplementing CO2. You can also find greenhouses doing this in winter months, where the days are shorter.
Another benefit to increasing CO2 levels is that a succulent can grow quicker because of the increased carbon dioxide in the air.