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For one, woody biomass turns to better biochar because it has a higher carbon content than leafy material or grass.

Researchers who examined nine mummies found that though there was some difference in the intensity of their odours, all could be described as "woody", "spicy" and "sweet".

According to Ofgem, accurate sustainability data enables the government "to understand and monitor the extent to which both primary forests and sawlogs are used in woody biomass, which has consequences for carbon emissions and biodiversity".

"Our research supports keeping old quarries open. This can be achieved by local nature conservation organisations or landowners, for example by removing woody plants or extensive grazing," explains Thomas Alfert from NABU.

Biodegradable yet tough enough to withstand hurricanes, leaves get their strength from their “skeleton,” a highly ramified network of fine veins made of a woody compound called lignocellulose.