Sure, change happened before humans. But we’re making these changes BIGGER and FASTER.
The world is made of an amazing web of connected processes and organisms. It’s a wonderful system that evolves and adjusts to small changes over time.
But when we as humans are changing and eradicating whole ecosystems and species in such short periods of time, the world’s cycles and processes can’t adjust quickly enough to compensate.
We are contributing to and making fast, large disturbances/changes.
Increases can also be seen in the greenhouse gases since industrialization (contributed to by burning of fossil fuels): see cycles of Carbon dioxide, Nitrogen, Methane, etc.