Several countries have raised petrol taxes, and now tax leaded petrol far more heavily than unleaded fuel.

ECONOMIST: Taxes for a cleaner planet

ANFIA. Spain argues that the incentives are needed to phase out leaded petrol by early in the next century.

ECONOMIST: Incentive schemes

One obvious example is the quick and relatively painless adoption of unleaded petrol, thanks to differential tax rates which discriminated against leaded petrol.

ECONOMIST: The Liberal Democrats

Waiting for high levels of scientific and clinical proof before taking action to prevent well-known risks can lead to very high health and economic costs, as was the case with asbestos, leaded petrol and tobacco.

FORBES: Connect

The crime waves that afflicted many parts of the world and then, against all predictions, collapsed, were ascribed, in an article published by Mother Jones last week, to the rise and fall in the use of lead-based paint and leaded petrol.

FORBES: The Problem For The Left If Tetraethyl Lead Really Does Cause Crime