Have you seen literally any chart covering just the past one to two hundred years, or even just the past 50-70 years that covers emissions, population, industrial scale, environmental destruction, weather patterns, etc.? They would answer your question.

There is no end to the concrete evidence of the negative effect of humans towards the climate.

Here's something simple. Deforestation is directly caused by humans. (Note that wildfires "deforest" but without human intervention, they grow back and thus reforest.). So then ask yourself, what is the role of forests and jungles within the environment and climate?

Look at this article: https://ourworldindata.org/deforestation. What began 10,000 years ago, 200 years ago, and 100 years ago? This couldn't possibly be major changes in human activity could it?