I don't think the study contains a lot of new revelations. Of course, oil reserves will at some point be depleted. But it will be a slow decline in oil supply and accordingly rising oil prices. This gives governments and industries some time to prepare and develope other sources of energy. Sure, there will be some, probably significant economic and geo-political impact, but I don't expect it to be entirely negative, as the study seems to suggest.
However, investing in other energy sources now would certainly be a good choice, as you'd rather produce the technology than buy it from elsewhere. Education is the basis of that as well, of course, as ignorant people are less likely to make the right choices, and even less likely to succeed.
If we can't do anything, why care about it?
Are you greeting your friends every day with the words: "You are going to die sooner or later!"?
"The first thing Fascists usually try to do is silencing the opposition."