What if the desert in China suddenly turned into a forest?

The desert of the earth accounts for 1/3 of the non-ocean surface. If the desert becomes normal land, it needs to absorb 200-300 atmospheric carbon. Therefore, the atmospheric carbon content drops sharply, and marine carbon will be released, but it should not be enough. Plant photosynthesis is blocked, the greenhouse effect is reversed, and the earth cools down. Plants died on a large scale and returned to the desert. Unless a large number of fossil fuels are burned at the same time, the carbon in the atmosphere will maintain a dynamic balance. This is not an oasis or a desert, this is a forest. The ecological circle will be destroyed and many animals unique to the desert will have nowhere to live.