I've heard more CO 2 in the air could be beneficial for plants and crops. Elevated levels of CO 2 can essentially fertilize plants and crops. Modest temperature increases, for example, can enhance growth, but if temperatures increase too much growth actually declines. Rising temperatures also increase the process by which plants release CO 2 . Higher temperatures can increase the rate of evaporation, drying out soils.
Insufficient water decreases plant growth.
Plants also cannot respond to more CO 2 unless sufficient nutrients are available. Furthermore, the growth-enhancing effects of CO 2 may diminish over time. Real-world crop yields would also be subject to the hazards of droughts and floods under a changing climate. I've heard CO 2 emissions from human activities are small compared to what's released by nature. The Earth has a natural CO 2 cycle that moves massive amounts of CO 2 into and out of the atmosphere.