Noor Mohammed : India may have earned some goodwill from the international community by promising significant reductions in its carbon intensity of GDP at the recent Copenhagen summit. However, the real challenge lies in implementation. If India fails to meet the challenge, it might end up losing credibility. Unfortunately, the way India is implementing its planned switchover to Euro III and Euro IV norms for auto fuels does not inspire much confidence. Significantly, the roadmap for the phased introduction of cleaner auto fuels was not an initiative of the government. It was prepared at the instruction of the Supreme Court. High content of sulphur and aromatic hydrocarbons in petrol and diesel posed a serious risk to public health. That drew the apex court