Loss of glacier would imperil coastlines worldwide

[jimmy the one]

3. Not a question of if, but when ... thanks industrialized nations

Since the best that modern scientists can hope for is merely a reduction in the rate of increase of global warming temperatures, the eventuality of what you portend above will happen, likely within the next fifty years. Global warming will continue and glaciers will continue to melt as per entropy demands until continents shrink away.
Wildfires will continue to be more and worse.
Heat waves will continue to be hotter and longer and get worse.
Fossil fuel usage and renewable energy suppression under trumpass administration will help accelerate the rate of increase even more.
Americans answer to the problem is 'turn up the air conditioner it's hot in here', which in itself will add to global warming by more energy use.
The upward spiraling in global warming is uncontrollably out of control.
In retrospect, thanks industrialized nations, for nothing.
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.. not an ego, jimmy the one is a british naval term.