Sent_en: 2zh The Living Planet Index is based on population trends between 1970 and 2003 of over 3 600 populations of more than 1 300 vertebrate species from around the world.
Sent_yy: 生命星球指数基于1970年至2003年间来自世界各地超过1,300种脊椎动物物种的3,600多个种群的数量趋势。