Identify the topic, opinion and so what in the sentence.

In Field Notes from a Catastrophe, Elizabeth Kolbert seeks to use the evidence she has collected across her years of worldwide travel to show how we should best address climate change. Kolbert uses the island of Samsø to support her case for the mass implementation of alternative energy sources, but she does not point out the many cons that come with the use of alternative energy sources that are wind, biofuels, and solar which is reason enough to refrain from attempts at a greater implementation of them until problems of space, waste, and cost are addressed.