What about bamboo charcoal?

Bamboo is a fast growing, renewable, widespread, environment enhancing resource. Bamboo fields are very dense, allowing for greater yield per acre and higher availability.

Under the right circumstances, bamboo can grow as much as two feet in a single day, and since bamboo plants are never clear cut, some species can produce for over 60 years! And as well as being highly renewable and extremely hardy, bamboo is 30% more efficient at producing oxygen than traditional timber.

Bamboo charcoal has a long history in China and its use has been documented as early as 1486 AD, during the Ming Dynasty. Bamboo charcoal is made from lengths of bamboo harvested from plants five years or older, then burned in an oven at temperatures greater than 120 °C. It benefits environmental protection by reducing pollutant residue and is an environmentally functional material with excellent absorption properties. Bamboo charcoal is made by means of a pyrolysis process. Depending on the nature of the raw material, bamboo charcoal can be classified as raw bamboo charcoal or bamboo briquette charcoal. Raw bamboo charcoal is made of bamboo plant parts such as culms, branches, and roots. Bamboo briquette charcoal is made from bamboo residue, such as bamboo dust, saw powder etc., by compressing the residue into sticks and then carbonizing the sticks. Bamboo charcoal is known to have high porosity. Various impurities or foreign matter will be absorbed over the wide surface area of the charcoal. When air passes over, if the humidity is high, the charcoal will absorb the moisture and the air will be dehumidified. If the air is too dry, the charcoal will discharge its own moisture, balancing the humidity in the air.