High Temperatures and their connection to aggression

Everyone's heard of the term "hot-headed", basically another word for aggression. The term might actually mean something that actually happens. There have been a lot of studies about how heat causes people to get cranky or how when people get angry they get really hot for a second. The connection people have been making is that Global Warming ends up actually causing more conflict and violence than if the world were cool. Research done by James Rotton, however,  shows that anger doesn't always increase as heat does, but how moderate temperatures cause aggression, while extreme hot conditions show a decline. I agree that hot temperatures can make some people angry, because if it's hot outside it makes everything hotter to do and doing so can make some people very irritated which in turn can lead into aggression, but saying that global warming can cause wars is just another slippery slope fallacy. I don't believe that global warming can lead up to something as big as a war because of just heat.