Your points are exactly why travel is so important.
I have never been to the US, but I have heard they don't travel and it wasn't that long ago that, that the majority of senators hadn't been outside the US. That tells something I reckon.
Funny you should mention about the climate change affecting crops, because while we were talking (Client and I), he ate an apple and showed it first saying "It is from a colleague's garden, but they look like they have come from overseas"
While they might not be growing mangoes for a while, I suspect there ware going to be impacts on what can be grown. But, there are also likely to be some pretty major storms too as the climate shifts.