Slowly, what went on was anger in this contest. As the matter proceeded, I realised that Ratan Tata was driven to the case genuinely believing that we were doing this on behalf of his competitors — petrol car guys. But once it was established that our campaign was based on the emerging science of PM2.5, and the health impact of diesel as an automotive fuel — the mood changed. This is not to say that Tata Motors backed down from its diesel car ambition. And it is not as if we gave up our fight against diesel vehicles. But it settled into what you can say were good old-fashioned democratic traditions of acceptance of contrary views. In fact, when Ratan Tata launched his pet project, the Nano cars, at the Delhi automobile exhibition, he called out my name, saying that he hoped this affordable vehicle would meet my approval. Amazing and humbling.