As above. Anyone who thinks people cannot affect the climate is simply wrong-headed. People affect everything they touch. We have destroyed the ecologies of entire countries, pushed numerous species to extinction, fundamentally altered natural systems. Why wouldn't we also have an effect on the climate?
I can only assume that @Maxlv feels the planet is so large that we can't really make much of a dent in the atmosphere
There are 1 billion vehicles in the world, spewing out fumes in the time it takes to rack up 10,000km or more per year
There are always between 6000 and 10000 aircraft in the air at any one time, spewing out fumes from the 2 or 4 turboprop or 2 or 4 jet engines
The Earth is big but it isn't that big, and as many greenhouses gases are active for a hundred years, or more, or less, they are added to, not replaced by new emissions