The chapter identifies primary and secondary negative environmental impacts of the numerical size and growth of the human population. Findings of scientific studies, especially findings of multivariate analyses of quantitative data, are summarized on the effects that human population size, density, and/or increase have had on the severity of the COVID-19 pandemic, on human death rates generally, and on the climate of the planet. Through climate change, population size and growth have had secondary effects: Research indicates that climate change has increased wildfires, damaged agriculture, hurt economic activity, intensified hurricanes and typhoons, caused flooding and droughts, and diminished biodiversity.
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