Baseline is important for rigor. This can be negated if it is new research and thus the baseline is the research itself.
It is necessary in this case to identify that weakness in your research. If that is the case in this topic.
I like the reference and example of the Daintree and then local recyclying scenario.
Variation in rainfall is a nice topic for discussion. I went through almost 8 years of varying rain and now for the last two it has been too much. I am not complaing about the rain only the erosion it causes.