With the population explosion in the city and decrease of land resources, using land in stereoscopic form has become a general trend all over the world.

随着城市人口的快速增长和土地资源的日趋稀缺，以立体方式利用土地，已成为世界范围的普遍趋势。

youdao

But he pooh-poohs any suggestion that global warming might have something to do with the population explosion.

BBC: Parakeet in a London garden

The subsequent industrial production of billions of tonnes of synthetic nitrogen fertilisers - particular after the 1950s - have flooded terrestrial and aquatic ecosystems with reactive nitrogen, and supported the century's human population explosion.

BBC: Leaving our mark: Fossils of the future