Avoid such unnecessary phrases as I believe, I feel, and in my opinion. There is no need to remind your reader that what you are writing is your opinion. Self-reference is another—very obvious—form of qualifying what you say.
Eliminate needless self-references in these sentences.
It seems to me that nuclear energy is safer and cleaner than burning fossil fuels. I think we should build more nuclear power plants.
The author, in my personal opinion, is stuck in the past.