I think we likely are changing the climate, albeit possibly not in any measurable way. There are 7 billion of us, it's reasonable to assume we are changing the climate. Just the heat output alone from engines is probably affecting climate.
That being said, I dont' see much evidence for any harm being done to the earth at all. Go outside and look around. Bird are still chirping, crops are growing. Seas don't seem to be rising at all.
Don't buy into the narrative. The size of this planet is literally beyond human comprehension unless you use mathematics as a guide. Human beings occupy only 5% of the planet's livable surface. Also, every day the sun radiates 30 nonillion watts of energy onto the face of Terra - that's roughly 10 million times the amount of energy that the entire human race could generate in an entire year - EVERY DAY. Not only that, nature emits anywhere from an average of 10 to 100 times more carbon dioxide into the atmosphere every year from decay of vegetation, deep ocean current upwelling of methane, natural plains/forest fires, volcanoes than the human race. And of course, carbon dioxide is an inert trace gas which is never much more than an average of 0.04 % of the atmosphere to which nature contributes the much large amount. So human beings contribute only a fraction of THAT amount. To compound the Human Race's insignificance, the effect of trace gases on downward forcing of black body radiation (atmospheric heat retention) is almost inconceivably minuscule relative to the other contributions of energy to the total climatic heat distribution/mediation in the system. We must compare human contribution to not only variations in solar radiant output, but also cosmic ray effects on upper atmosphere cloud formation, variations in orbit, variations in axial tilt, distribution of the biggest "greenhouse gas" H20 in the form of vapor, fog, humidity,variations in ocean currents, lakes, rivers, rain and Coriolis wind variations - any single factor which contributes more energy to the system than human trace gas emissions.
Bottom line is, all intuitive feeling-centered impressions to the side, to believe that the minuscule human contributions to the climatic heat effects could somehow overwhelm the energy contributed by the other total energy of all of those other factors combined, is to believe that a spit-wad could derail a freight train.
Sometimes intuitions are wrong. Sometimes the raw reality of mathematics overwhelms impressions based on gross daily subjective experiences or notions of humanity's assumed puissance relative to the totality of the enormity of the universe.
That's why the mass media never, never NEVER talk about the raw numbers. Physicists model large planetary systems using total energy contributions as the guide. Emotional impressions have no real value in that model except in regard to poetry or musings in reverie on a lazy country outing or nodding by the fire.
