What will you write for an introductory paragraph? What is the point of your essay? The essay on page 99, for example, has a point: nuclear power is bad and shouldn't be used to replace the oil and gas that we're running out of.
What do you want to do? I don't know the answer; it will depend on the points you make in your essay that come from your research.
By the way, "ecological" is an adjective, not a noun. I think you are referring to the environment.
You wrote two sentences, but I want a clear, specific thesis statement like the ones on pages 57 and 99. (I don't understand the English in your second sentence.)
You're making progress; this takes time, a series of small steps.