As the air's CO2 concentration continues to increase, it will likely boost rates of net photosynthesis in nearly all plant species, including white clover and perennial ryegrass. These increases in photosynthesis, in turn, will likely lead to greater root production and enhanced exudation of organic compounds below ground into the soil rhizosphere, which should stimulate the growth and productivity of microbial organisms living there.
Fallacy: oversimplification