人类生物量迁移规模远超陆地动物总和

Core Insights - The scale of human biomass migration is 40 times greater than the total biomass of all existing terrestrial animals [1][5] - Since 1850, global wild mammal biomass has decreased by over 50%, with marine mammals experiencing a significant decline of approximately 70% [1][5] Group 1: Human Migration Impact - Human biomass migration is defined as the total biomass of a species multiplied by the distance it actively moves each year [5] - The study indicates that human migration has increased by about 40 times since 1850, contrasting with the halving of marine animal biomass migration during the same period [5] Group 2: Wild Mammal Biomass Decline - The research highlights a dramatic reduction in wild mammal biomass, with a total decline exceeding 50% since 1850 [5] - The decline in marine mammal biomass is particularly severe, with a 70% reduction attributed to the decline of larger species such as blue whales, humpback whales, and sperm whales [5]