Tough denotes that majority has opted out from this option so it is being assumed that it is tough. But on the contrary for positive minded, tough can turn out to be easier than tougher.
Generally average person will wish not to attempt those topics which are out of box as you require in depth domain knowledge.
Essay topics like Carbon Credit, Green Marketing, Public distribution System, Work & Life balance sound different.
A bit of thought process with application of can do attitude will force you attempt and rest can be history.
Reading, listening and writing are very basics of preparation for Essay writing. Once flow is achieved with direction of not getting out of focus, elaboration with sustaining theme can be concluded with message.
Perhaps Essay writing is the test for writing on those topics which others have not tried.