The obvious question then is: Was there silica available in the early earth environment?

在早期地球环境中是否存在二氧化硅?

The Anthropocene is a proposed geological period in which human activities have had a very important effect on the earth's environment and climate.

人类世是一个拟议的地质时期，在该时期人类活动对地球环境和气候产生非常重要的影响。