

The first Earth Day was in 1970. It might have been too late even back then to avoid any consequences because nature had been absorbing what we had already done for a long time, but it sure would have helped to slam on the brakes. We should absolutely keep trying to get those brakes pressed, but it’s debatable if we’re already over the cliff.
You’re not a doomer if you’re seeing all the evidence and putting it together. You’re a realist. The label “doomer” is just reactionary from those who want to keep the status quo and don’t like people pointing out reality.
The reason: while alternative energy has grown very rapidly which gives the impression of replacing fossil fuels, demand also increased (maybe faster) so the ratio is similar. Also, fossil fuels can’t be replaced everywhere. Think heavy duty machinery, most aircraft. Reduce demand and consumption (a topic of debate on its own of how and what) and maybe the ratios would be more on the alternative side.