[elcomet]

There still is plenty of wood to burn, no?

[pjc50]

Wood is much less energy-dense and requires much more manual labour to process. Global steel production only took off after the switch from wood-charcoal to coke made from coal, at Coalbrookdale: https://en.wikipedia.org/wiki/Coalbrookdale

[rishav_sharan]

But wood and wood charcoal is still enough to take you past the Renaissance