A little help

[Magister Militum Flavius Aetius]

Hi guys, I'm making a powerpoint on climate change and geography and it's effect on the expansion of rome and Rome's economy etc. and I need some sources. Could anyone help here?
B.T.W. Some things happened, so I'm back. But I'm gonna take a break for a while from IBUR so yeah.

P.S. I know how it effected all of that, but I don't have any real sources besides wikipedia. That's what I need.
P.S.S. If this doesn't belong here I'll transfer this to vestigia vetustasis

[juvenus]

yup, i suppose you should ask that somewhere else.