These limits could be imposed by decreases in b or by increases in d. Logistic growth is very idealized, of course. However, the model is useful conceptually. Initially when the population is small and resources are abundant, growth is rapid. Then as resources decrease, growth decreases and finally stops.
Most organisms can do little to change the carrying capacity of their environments, but humans have.
Our growth has been enabled by development, which has allowed us to use an increasing proportion of Earth's resources for human needs. Some argue that the concept does apply, at least in the general sense that resources are finite for us and we are fundamentally constrained as are all other organisms. Others, of course, argue that the concept has no relevance to the human condition, because of our infinite capacity to develop solutions, as previously described. This perspective argues that if we destroy the planet by living as though K doesn't apply to us, we may take the rest of life with us. After doing so, go through the lists, and evaluate the kinds of value judgments that went into making your lists.