All human activity combined accounts for at most 5% of total CO2 emissions. The rest comes from natural sources.
Some will say that while the human contribution is very small, it has an outsized effect because it exceeds natural sinks, to which the answer should probably be finding more ways to capture carbon from the atmosphere, rather than making poor people starve to death for the climate project.
The idea that we can stop the climate changing is, however, hubris. The climate lobby conveniently ignores the fact that we have just left an ice age and the earth is warming up to its normal temperature, which the geological record suggests is about 10c warmer that it is today. IE. We are living in an abnormally cool period and it can't stay this way forever just because it suits us and we don't like change.