"I looked at the impact of lead in fuel and at that time, other countries had banned lead in petrol but we were still using it and I wanted to look at the impact of that on the environment. When you emit all these into the atmosphere and it rains, it runs into rivers and most of our pollutants go into rivers. I looked at the lead level in rivers in Ibadan. I looked at the impact on fish and I was able to see that what goes round comes round."