First don't assume that all Carbon Dioxide is bad and should be curtailed. In fact, Carbon Dioxide is essential to life itself since it forms a part of the natural cycle called the Carbon cycle. O As long as other intervening factors do not insert themselves, this balance is maintained.
Many industrial processes involve the combustion of fossil fuels such as coal and petroleum fuels.
In addition, a more sinister product of incomplete combustion occurs when the combustible fuel does not receive enough Oxygen gas. This product is Carbon Monoxide. It is considered toxic. The effects of the toxicity will depend upon the concentration and length of exposure. The symptoms of mild toxicity are nausea, headaches, irritability.