Hello ,
The amount of money you get will depend on so many factors like number of blogs you published , number of views you get , country of traffic etc , but going through data of other bloggers can expect around 20 thousand INR in the beginning which will increase with experience and time .
As you know environment is a very important topic and many people want to read more and more about it as it directly affects their life , so if you do some hard work you can expect a good enough revenue every month .