In order to grow, plant life needs sunlight, CO2, water and various nitrates/nitrites. The exact proportions vary from plant species to plant species. Any of the four can be a limiting factor, but as it only comprises 0.03% of the atmosphere CO2 is by far the most usual one. Therefore if the concentration of CO2 goes up, surely plant growth is going to be less constrained, photosynthesis will increase and will therefore "consume" more CO2. So therefore, isn't the problem to some extent self-correcting?
It is self-correcting. The manmade CO2 (calculated from fossil fuel use) is 1/2 abosrbed by nature. The rest is too much to be absorbed so it is building up. But there is solid research to indicate that nature will absorb more. The alarmists say that nature will absorb less, but they are confused by CO2 feedback processes that take 100’s or 1000’s of years. They will even push CO2 or methane feedback on science sites as fast, but it is not. One thing the alarmists don’t mention is that if we stopped producing CO2, the levels would fall about half way back to our preindustrial level in about 40 years. Instead they claim 500 or 1000 years which directly contradicts their claim that the ocean is “hiding” heat (it can’t hide heat but not hide CO2, it is the same ocean turnover that hides both).