A core part of historians’ work is to give meaning to historical periods. In 2019, the “green wave” seemed to signal a growing awareness of climate issues, whereas today political commitments appear to be stagnating. Does this turnaround surprise you?
SP: The history of the environment challenges the idea that we polluted unknowingly and that only from the 1970s onwards did we become aware of pollution and begin to address it through regulatory thresholds or new green technologies. Together with my colleague, historian Tiphaine Robert, we show that the toxicity of lead was known as early as the 1920s. Switzerland first banned leaded gasoline, then reversed its decision in 1947 under the influence of industry and international standards. Once a toxic substance is adopted on a large scale, it becomes extremely difficult to reverse course.