According to recent calculations, maintaining such a rhythm of growth would result in 60 million billion people on the earth in 900 years, which represents 120 inhabitants per square meter.

【参考答案】

根据最近的统计，如果保持现在的人口增长率，900年后地球上人口将达到六万万亿，这意味着每平方米就有120个居民。