"贵"usually means "expensive or valuable", but it means "respectable" in this sentence. "环境" means working conditions when talking about company or workplace.

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贵 is a polite word to add in front of some man or items you refer to, it shows your respect. usually, 贵公司 is used during your conversation with the employee of that company. In other cases, we say贵人, that means this man has helped you a lot, this is one of your way to say thank you. 环境in this case means the workplace is nice or the environment is well decorated. When 环境refers to the nature outside, it will show up with other words like 自然环境 or 环境保护. Similarly, when it refers to the condition, it may be 大环境 . Hope my answer is helpful！Have fun learning！

贵 公司 不但 很 有名，而且 工作 环境 好。 It's not only your company is famous, but also working environment is good. 贵 = precious = here it means polite your 环境 = environment

贵 表示尊称 相当于您的公司 环境表示工作氛围很好