PO -& Global warming (or why not just make it easy for your self?)

Why all this talk about Peak oil? Why not say Global warming? - then everybody knows what we talk about.
The cure is the same for PO (Peak Oil) and GW (Global Warming) - use less energy.
So what is the problem (why do you always have to be so difficult (and gloomy))?
My view on GW is this: First things first - Its like triage. Solve the most pressing problems first and GW isn't the most pressing global problem. For me it is not a question about for or against GW. It is not about if GW is real or not. GW is just not the most pressing problem - PO is. The consequences of GW is maybe 50 years away - PO is here and will have severe consequences within 20 years. That makes it easy to prioritize.
And if we solve PO, we have solved GW - even better.

Again if you don't believe me - fine, okay, sure - please prove me wrong.
More info on Peak oil:
http://www.lifeaftertheoilcrash.net/
http://www.peakoil.net/
http://www.theoildrum.com/