Gas roasting is the most common way to roast coffee and it can leave burns on the beans, produce an uneven roast and inconsistences in flavours and blends.

However, at The Wood Roaster in Sydney, they've mastered this by using an air roasting approach through a custom built, fully temperature controlled roaster, fuelled by wood. 

This roaster is able to utilise the dry heat to draw out the inherent flavours of the high quality beans they source. 

They say that wood roasting is the most sustainable, renewable and environmentally friendly practice compared to gas and other roasting styles.

https://www.thewoodroaster.com/