Carbon credits are permits that allow the holder to emit one ton of carbon dioxide. Companies can buy and sell carbon credits to balance emissions and reduce their carbon footprint. India is a large emitter of greenhouse gases and has the potential to earn money through carbon credit trading. The document discusses how carbon credits are calculated based on biomass and tree planting. It outlines India's current emissions, policies around carbon markets, and companies involved in carbon credit trading. The future of carbon credits is promising as more companies adopt net-zero goals and demand for credits is expected to grow substantially in coming decades.