One of the things I try to do in my fiction is show any collapse scenario as a process.
Your standard “if this goes on” story is all about looking ahead to see the result of current trends. But trying to see the endpoint of climate change, peak oil, habitat destruction, environmental degradation, or any similar process is going to be misleading. There is no endpoint—things keep going on.
I think the destruction wrought by Sandy is a good example. I’ve read a lot of stories set in a world where climate change has inundated the coasts. What aren’t nearly as common are stories set in the world we’re approaching: A world where the coasts are inundated only 1% of the time (or, a bit later, 2% of the time). A world where we see a 100-year storm every 8 or 10 years. A world where all our infrastructure spending is going for repairs, and yet we keep falling behind.
I say this is a world we’re approaching, but we may have already reached it. How many 100-year storms can you have in a decade before you have to admit that it’s not just a statistical anomaly, but rather is the new reality?