I want to know the answer to the following question:
What is one thing that helped to improve condition of forests, rivers and air?
All the background I'm provided with is that "The condition of forests, rivers and air was improved by modernizing factories, houses (decline of coal heating) and cars, and contaminated areas such as the former Uranium surface mines around Ronneburg have been remediated.". Is that enough to answer the question?
Answer: yes