To clarify I meant over the last 5 million years.

There has been no man-made climate change during the period of "modern humans" either.

It's not a conspiracy as such - it helps to think of government and corporations as an AI. A hive intelligence with constraints and goals. The constraint is to operate within legislation and keep the people on board, the reward/goal is to acquire money/power.

At this stage the financial system (which we gave a money printer!) has obtained enough power to steer legislation in its favour and keep the people on board though manipulation of the mainstream media and education.

Show me the incentives and I'll show you the outcome.

I completely agree that there's no reason why we can't replace power plants with more environmentally friendly ones as they are retired, but ask yourself why Germany then has shut down it's fully operational nuclear power plants. Even with energy shortage and the many of the plants ready to be turned back on tomorrow, the state refuses to.

Manmade climate change is in the context of the last two millenia. The issue is not just the absolute temperature but the rate of change and human survivability. Homo sapiens only evolved ~200k years ago.