Renewable Energy Credits (RECs) are a market based instrument to promote renewable energy power and facilitate renewable energy portfolio obligations. Tradable RECs have been used extensively as a successful market-based policy instrument to promote renewables in Australia, Japan, the US, the Netherlands, Denmark and the UK.

Charcoal is perhaps the best example of biochar. Considering the interest that has been generated by Jha et al. many readers would be interested in knowing how actually charcoal is made. During one of our recent field surveys to Kasera locality in Kangra District, Himachal Pradesh, (Correspondence)