The world now have has recently faced serious air pollution and power shortage.
... world is the subject and it is a singular word.
The facts outlined above, when taken together,
I guess you better write something like;
In conclusion, I feel that xxxxxxxxxxxxxxxxxxTake for example, the latest disaster Fukusima ... Good example!
These source can also solve the environmental issue which is the biggest drawback of the nuclear power .... this sentence is confusing to me; it does not give a clear idea to the reader :(
Overall a good essay ! You have the right essay structure; good reasons and more than everything you provide good examples for your reasons.
Wish you good luck!