The Thai climate bill's emissions trading (ETS) provisions are moving through parliament and may take effect the year after next, creating a mandatory carbon market alongside the voluntary one. The Stock Exchange of Thailand plans a trading board that will let voluntary credits offset up to 10% of mandatory obligations. Buyers now ask about quality, verification and permanence rather than just price. For most small firms this is not an immediate cost, but if you supply large companies, expect them to ask about your emissions data and carbon plans. Start by measuring your own emissions, since about 40% of surveyed firms have never done so.