We don't know much about the weather conditions before the flood but I think they were probably quite different to out present climate. People certainly lived a lot longer but that may be due to the Lord allowing that before He shortened man's days.
In time past, the Lord's first advent, He stilled the raging waters with a word. There is a lot of weather in the bible!
We are now approaching the end of this age. Wars and rumours of wars (the cold war), yes, we have had that. Matthew 24:-
6, And ye will be about to hear of wars and rumours of wars: see that ye be not troubled: for all these things it is necessary for them to arise, but the end is not yet.Luke, in chapter 21, describes this slightly differently:-
7, For nation shall rise against nation, and kingdom against kingdom: and there shall be famines, and pestilences, and earthquakes, in different places.
8, All these are a beginning of birth- pangs.
9, But when ye shall hear of wars and unrest, be not scared: for these things must first come to pass; but the end is not immediately."By looking closely at both passages, we can see that we are in that time when the next major international dust up, "nation shall rise against nation, and kingdom against kingdom", is about to unfold.
10, Then said He unto them, "Nation shall rise against nation, and kingdom against kingdom:
11, And great earthquakes shall be in divers places, and famines, and pestilences [dearths and deaths]; and things that fill with fear and great signs shall there be from heaven.
The birth pangs will start then. The next conflagration of nations signals the beginning of the end times. This is what is REALLY going on on earth today.
My guess is that soon the "babylon" mentioned by the prophet Isaiah (not mystery babylon, that is something else though closely connected), that system of international trade that relies upon deep water ports and coastal cities, will be engulfed by the rising seas. There is a lot of talk about the arctic melting but consider, if the east antarctic ice sheet melts, sea levels will rise by 50 metres!!! These frozen ice/land masses have been there since the days of the Flood of Noah. As the end of the age approaches, these guardian ice sheets, that have controlled the weather systems of this good earth since Noah's Flood, are going to wreak havoc on the systems of men.