One question I ask deniers such as yourself and have never has a single reply is: Plainly we can't add CO₂ to the atmosphere for ever (if you disagree 'll find a chamber with 25% CO₂ for you to spend some time in) so there must be a point where it's too much - what is that point? -- You don't know so how can you say with any confidence that it's not already a problem when literally every climate scientist on the planet says it is.
I can say with 97% confidence that it isn't a problem. Climate 'science' is the problem. Go do some research into how the '97%' figure came about, or just think about why 'consensus' in science isn't really that important. Especially when studies like the 97% ones don't actually represent climate scientists. There are a lot of climate scientists who disagree with the dogma, but of course they get branded climate deniers instead. We used to be called sceptics, but then the PR gurus behind the dogma probably realised scientists are supposed to be sceptics, not deniers of reality.
But it's a good question, and if you thought about it, you'd realise the problem. It's basically the question I asked Muskrat, and they couldn't answer, and is this-
https://en.wikipedia.org/wiki/Climate_sensitivity
Carbon dioxide (CO2) levels rose from 280 parts per million (ppm) in the 18th century, when humans in the Industrial Revolution started burning significant amounts of fossil fuel such as coal, to over 415 ppm by 2020. As CO2 is a greenhouse gas, it hinders heat energy from leaving the Earth's atmosphere. In 2016, atmospheric CO2 levels had increased by 45% over preindustrial levels, and radiative forcing caused by increased CO2 was already more than 50% higher than in pre-industrial times because of non-linear effects.[12][note 1] Between the 18th-century start of the Industrial Revolution and the year 2020, the Earth's temperature rose by a little over one degree Celsius (about two degrees Fahrenheit)
This is on from wiki, so it must be true. And there has been much edit warring over anything climate related on wiki to ensure The Truth is maintained. And then..
The equilibrium climate sensitivity (ECS) is the long-term temperature rise (equilibrium global mean near-surface air temperature) that is expected to result from a doubling of the atmospheric CO2 concentration (ΔT2×)... Computer models are used for estimating the ECS
So this is the multi-trillion dollar question. How much warming, for how much CO2, or the expected temperature response per doubling. So for simplicity, 280-415ppmv = 1C warming. Next doubling would be 415-830ppmv and we'd get another 1C. So by the time we're at 830ppmv CO2, we'd have warmed by a whole 2C! Maybe. So then it becomes a simple question of finding the carbon to do this. Since 1850, we've burned gigatonnes of fossil fuels and maybe increased CO2 levels to 415ppmv. During that time, we've also gone from domestic coal and Clean Air Acts to burning fossil fuels more efficiently.
How would, or could we generate enough CO2 to hit 830ppmv? Where is the carbon?
Then there's the 'non-linear effects'. It's assumed ΔT CO2 is a logarithmic response, so front-loaded, hence the claim that going from say, 280-320ppmv provided 50% of the radiative forcing and so most of the 1C warming we've measured to date. So as we increase CO2 beyond 415, we should see warming accelerate again and then level off. But we don't. But this is where climate 'science' meets homeopathy, and the less you have, the greater the effect.
But as wiki explains, ECS assumptions are plugged into climate models, and those spit out results ranging from +11C warming to very little. Funnily enough, models have become more accurate by lowering ECS, which is why it's been revised downwards pretty much every IPCC Annual Report. Those reports also explain that the atmosphere is relatively insensitive to CO2 because of it's basic physical properties, ie it's a weak GHG. But to get to Thermageddon scenarios, climate 'scientists' have also assumed a slew of 'forcings' and 'feedbacks' where the effects of CO2 are somehow amplified to produce scarey numbers. Reality and observations have proven most of those wrong as well. Climate deniers assume that if their models say their predictions are true, then it must be reality that is wrong. Climate sceptics tend to prefer to trust reality and observations.
But CO2 is far more economically important than it's radiative properties suggest, ie it's a proxy for human activity, and human activities can of course be taxed and regulated. Ecofreaks don't like oil & gas, therefore seize on it's CO2 potential to try and ban it, and force social change. More pragmatic people just look at how they can profit from CO2 and flog 'renewable energy', carbon credits, carbon offsets etc etc. which is why there's 70,000 or so scumbags in Dubai at the moment looking for their slice of the Green pie.
But some good news has emerged, ie nations saying they're going to invest in nuclear power, which is a far more sensible use of their money than tilting at windmills. New fission reactors may provide clean, reliable, zero CO2 power for 30yrs or more, and by then, fusion may be commercially viable.