What did Earth look like before humans evolved?

Anatomically modern humans appeared about 200,000 years ago and behaviourally modern humans about 45-50,000 years ago.

This is a pretty short time frame compared with the age of the Earth (about 4.6 billion years) and not much has happened on a large scale in the last 200,000 years apart from man's influence.

One thing that did change about 200,000 years ago was the separation of Britain from mainland Europe due to a great flood.

Much more recently, Neolithic farming techniques along with associated deforestation arrived about 4000 BC. Before that, man seems to have been more of a hunter-gatherer.

The planet's landscapes, ecosystems, and biodiversity were very different before humans evolved. It was dominated by natural environments like forests, grasslands, deserts, mountains, and oceans. The atmosphere was made up of varying amounts of gases, and natural processes like plate tectonics, volcanic activity, and variations in solar radiation caused the climate to change over time. Because there was no human influence, ecosystems were shaped primarily by natural factors and interactions between species.