The Rise of Biochar: A New Era in Soil Health

Every year, billions of tonnes of agricultural residue from crop straws, husks, and even forestry waste are burnt or simply allowed to decay, resulting in huge amounts of CO₂ and other greenhouse gas emissions into the atmosphere. At the same time, almost a third of the planet’s soils have been degraded at various levels, putting food security, biological diversity, and lives of many farmers at risk. What if agricultural residue could become something not only capable of enhancing soil fertility but also absorbing carbon for hundreds of years? This is where biochar, a carbon-rich material created using a thermal decomposition process known as pyrolysis of biomass in the absence of oxygen, comes in as opposed to regular organic matter, which breaks down and allows carbon to release into the atmosphere, biochar is highly durable.  

According to the IPCC, biochar can stay in the soil for tens to thousands of years, being one of the few effective CDR technologies. The world’s potential use of biochar technology is no less astonishing. According to the IPCC, biochar could sequester about 0.3 to 2 gigatonnes (Gt) of CO₂ annually by 2050. In addition to being an environmental technology that helps mitigate climate change, biochar also has applications that contribute to improved soil quality and agriculture sustainability. 

One of biochar’s most remarkable features is its ability to permanently lock carbon into soil. Most of the carbon stored in the residues after burning or decomposition returns to the atmosphere in the form of CO₂. The pyrolysis process transforms much of that carbon into an organic form that is retained in the soil for centuries and even thousands of years. The European Biochar Certificate (EBC) says that 1 ton of certified biochar permanently captures approximately 2.0-3.0 tonnes of CO₂e (carbon dioxide equivalents), depending on the material used and the process of manufacturing. Such unique ability of biochar to store carbon has turned it into one of the quickest growing carbon removal technologies. Due to increasing interest to carbon credits of high quality, several firms, including Microsoft, JPMorgan Chase, and Shopify, invest in biochar carbon removal projects. 

The tiny pores within biochar work just like a sponge in holding onto water and nutrients which would otherwise escape because of leaching. Scientists have demonstrated that when biochar is used in poor quality soils, the crop yield of plants can be increased by 10-30% while at the same time increasing the soil water holding capacity by 10-25%. Furthermore, biochar is known to promote the growth of microorganisms in the soil and increases the efficiency of nutrient use, hence decreasing the application of artificial fertilizers and minimizing nutrient leaching into waterways and groundwater.

Biochar serves as an example of how a single technology may help solve many problems that humanity faces today. Thanks to the transformation of waste into a carbonaceous substance, it helps reduce greenhouse gas emissions, improve soil health, save water resources, and ensure sustainable agriculture. Simultaneously, the use of biochar in such spheres as sewage treatment, construction, and carbon sequestration increases the number of its uses significantly. 

As countries seek to achieve net zero emissions and climate-resilient agriculture, biochar is one of the most efficient nature-based solutions. This material shows that waste from agriculture can turn into a climate solution in the future.