First of all, it is best to graduate from an environment-related major, so there are a lot of software and formulas about atmosphere, water, soil, noise and so on. Have a foundation, easy to start.
It is also necessary to understand the production process and environmental problems of the enterprises that want to write EIA. Of course, we will learn directly from the scene, but some hidden problems need time to accumulate.
It is necessary to communicate with enterprises to satisfy them, and it is also necessary to communicate with environmental authorities for EIA approval. There is also an expert review, which can only be completed after passing.
Of course, there are also many companies that will give you a template to paint a tiger as a disaster.