ENVIRONMENT
In my opinion the worst problems that affecting the environment are  :trash and air pollution.
unfortunately in my country for a while people didn't care about the environment and they left their garbage on the nature specificlly in the  north of Iran that covered by parthenogenesis forest and Caspian sea.They were thinking that they have to keep clean their city or areas that they live in it and they didn't know leave the garbage could be really harmful for the environment in the future. As you know  some of  the trash are  non recycle and they remain in the nature for  a long time  and they don't be recycle by themselves.
After people saw they've lost their beautiful nature and they don't have more tendency to go to that nature  they stopped that bad habit .
Goverment with some volunteers  started to clean the sea and forest, most of that garbages were plastics,as you know plastics are non recycleable ,unfortunately lots of fish and birdes dead because of  the water pollution.
The other worse problem in Iran is air pollution.Iran is held in bad geographic situation that it doesn't have wind in fall and winter and because of that the air couldn't move and the air pollution is almost higher than the normal range in winter (Iran also has a dry fall and winter).These days because of the political interdiction Iran can't import the feul therefore it produses feul by itself and it's alittle far from the global standard and there are lots of carbohydrat in the Iranian fuel that causes the air becomes more polluted .
Goverment tried to act some roles such as :even and odd cars number and traffic zone  to prevent  the pollution but it didn't work well.As you know air pollution is really dangerous for people who have assma and heart deseases.
All of these problems have an affect on environment. The best way to keep clean  the environment is teach the people on media. I'm sure people and goverment together can have a big role to keep environment clean.