Co2 is also the biggest greenhouse gas, with 85% being co2.
Statements like this are incredibly misleading. CO2 is about the 'weakest' of any greenhouse gas we emit, N2O, CH4 and water vapour having a much much stronger impact on the greenhouse.
Whilst CO2 emissions make up the bulk of gasses emitted, the error range in calculating what proportion of the greenhouse effect they create is massive; it's nigh on impossible to calculate due to concurrent emittance and absorbency. It is absolutely critical to note that as CO2 levels rise, the greenhouse impact is nowhere near directly correlated, and a model much closer to an inverse log is the case, meaning over time the impact of releasing the same quantity of co2 gets less and less.
Co2 has very much become a scapegoat. Whilst it is important to try and reduce it being released, one shouldn't lose sight of the bigger picture. If you examine the climate models people use in depth, you realise the margins of error are absolutely phenomenal, and data can be manipulated to fit any agenda, climate positive or climate negative, very easily. Rahmstorf published a paper in 2007 which predicted future sea level rise in response to ground temp change. This paper has been cited scientifically 900+ times now, but when the method is recreated, even undergrad students can prove he absolutely wrecked the dataset in order to get a dramatic conclusion.
Government policy worldwide is often based on these predictions, simulations, the like... and when you realise they are often manipulated, or have wild levels of error, it can create immense scepticism towards taxation based on greenhouse ideals.