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