scientists assert that human activity has pushed the earth into a sixth mass extinction event. the loss of biodiversity has been attributed in particular to human overpopulation, continued human population growth and overconsumption of natural resources by the world's wealthy. the "global assessment report on biodiversity and ecosystem services" published by ipbes in 2019 posits that roughly one million species of plants and animals face extinction from anthropogenic causes, such as expanding human land use for industrial agriculture and livestock rearing, along with overfishing.