Climate changes

First day of the year, Medesimo, Italy. A lovely tiny ski resort at two hours from Milan.
I practiced my first snowboard falls here and i remember how the whether was during those first time.
Frozen with a lot of snow. I had think that those days never come back again due to the climate changes and the last two years confirmed my thought, where there was snow i saw green meadows.
How fast the climate changes are? I was and i'm very worried about it, and not just for snowboard.
This year things have started differently. Cold weather before the winter time and a lot of snow on the alps to create problems: http://www.ilsecoloxix.it/p/italia/2018/01/04/ASch47JM-cervinia_invito_andatevene.shtml.
I'll tell you a secret, i love the ancient history, in particular the Roman period.
Well, i wondered how he had done Hannibal to cross the Alps with elephants if there had been snow on mountain passes.
In particular, at that time, more than two thousand years ago, the roads we know today and the tunnels did not exist.
What does this mean? Probably, the weather at that time was different, maybe warmer.
I will tell you more, probably the climate changed because a few centuries later, Julius Caesar mentions that the mountain passes were full of snow and this could be a problem for his legions.
I think we need to learn a lot more about the climate of our planet. But the most important thing is that we must respect it more and preserve the resources for our children.