These questions are not clear,naive and SIMPLISTIC , but I will try ) Q1: what law it is > they are called enviromental laws Q2: how this law will take effects > As soon as it is enacted and carried out by enviromental officers. Q3: whether the environment has been improved by this law > How would I know ! Ask those Dept invloved that have all the information - before and after a new law is passed . ) Q4: explain what the government should do to improve the environment > That is why they come up with various enviromental laws to protect the enviroment .

the question's topic is a law about environment ,and there are four detail questions about it ......

I don't understand what exactly you're asking to be honest. Do you want someone to correct your questions or to fill them out or..?