I'm doing a perswasive speech


I need to organize my speech into 3 points with at least 2 subpionts each


the 3 big points are

problem, cause, solution


my speech topic is something like why we should switch to green reknewable energy like windmills and solar pannels



for problem I said something about

limited resources and pollution

???


for cause i said

expensive to switch

????

???


for solution I have

get solar panels and stuff



if you can suggest any other points to make it better, ples do, even put in comments if no answer space