Things that you should address are:
1) DEFINE climate change and the greenhouse effect. Explain how the greenhouse effect impacts global temperatures and how it works. Describe one way in which it may benefit life on earth and one way in which it can cause harm.
2) Present and summarize scientific evidence that demonstrates there is actually more CO2 in the atmosphere currently than there was in the ancient (last 500,000+ years) and recent (last 50+ years) past.
3) Summarize the evidence which supports that the extra atmospheric CO2 is due to human activities rather than an increase due to a natural cause or cycle.
4) Can Milankovitch cycles (long term natural climate cycles) explain the current warming trend? Use evidence to support your position.