Are 'green' environmental concerns -- about climate change, biodiversity, pollution -- deterring today's citizens from having children? This paper, which we believe to be the first of its kind, reports preliminary evidence consistent with that increasingly discussed hypothesis. Our study has a simple longitudinal design. It follows through time a random sample of thousands of initially childless men and women in the UK. Those individuals who are committed to a green lifestyle are found to be less likely to go on to have offspring.
Later analysis adjusts statistically for a large set of potential confounders, including age, education, marital status, mental health, life satisfaction, optimism, and physical health. Because there might be unobservable reasons why those who are pro-environmental may be less likely to want a child, and to try to ensure that the finding cannot be explained by selection and omitted variables, the paper explores Oster's (2019) bounds test. The paper's final estimated effect-size is substantial: a person entirely unconcerned about environmental behaviour is found to be approximately 60% more likely to go on to have a child when compared to a deeply committed environmentalist.
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