This is the classic catastrophe novel of the 20th Century and I appreciate the ending where there seems to be little room for optimism for the human race. There’s no cavalry coming to the rescue here, everyone on Earth is either dead, blind, or going back to basics for the rest of their lives. It’s quite a scary novel in that it made me think what I would do in this situation and how I would cope and now that we have both Covid and the spectre of Climate Change to deal with, it’s a very apt time to read the book.
As for the triffids, well they’re mobile plants with stingers and carnivorous appetites, so you would think with so few humans around and no other predators that they’d take over the world. Your only chance of survival is to go to a small island and get rid of the triffids from the island, which is what some of the humans have done in the book.