I'm old enough to remember the weather man doing the 30 day weather outlook - this was back when they used a black magic marker to write in the temps
on the USA map.
But my point being, those 30 day outlooks, back then, were extremely accurate. You could plan your weekends around them.
Over the years, it has all went downhill. They struggle to predict a three day outlook now. And then they usually miss it by a rainstorm or two.
And yes, mankind 'can" change prophecy, but with the folks out in this world acting the way they are, I don't see it changing. God said the only
way He would heal the land would be if man turned from sin and back to Him.
The proof that prophecy will be fulfilled? All you have to do is look at all of the atheists/other "religions" out there that cast doubt on God's
existence.
Put yourself in His place - if you created an entire world and mankind screwed it up so royally, you'd be p*ssed too. Mankind has taken Him out of
schools, out of the courthouses, out of life in general - and the Bible predicts that, for Christians, the persecution will only intensify.
But the good news, for Christians anyhow, is we get raptured up before the final wrath comes down. So no fireworks for us.