Yes, long-term climate cycles also exists but the important difference we’re confronted by with man-made climate versus the longer trends you refer to is that t

Yes, long-term climate cycles also exists but the important difference we’re confronted by with man-made climate versus the longer trends you refer to is that this is happening on a vastly quicker timescale, meaning that ecosystems (and our own societies) are unable to adapt. For instance on geologic timescales plants and creatures evolve, forests move, mountains sink and new reefs can grow, but when similar changes happen in the order of decades this is not just going to happen and everything relying on those ecosystems is going to have a real problem.