this could be condensed to remove another example of something- closing thoughts don't need to introduce a new example if they need to be here at all. Here you could go right to Check Your Understanding.

this one is good overall- it feels more concise than the other 2 and to the point. I can confidently answer the 3 questions at the end and I don't even have to do any reading. :)

what principles does this refer to? Above the diagrams-there is reference to elements- below the diagram it talks about tools- the first paragraph talks about foundational concepts- so which is it?

go back to the pond. In order for this to follow through- it should use the same analogy every time.

it might make sense to just stick to the pond example and not add more to it.

this could be worded differently- and even expanded into a great example of a system. Pesticides are used- these consequences are happening plus more- if we add harm to bee populations and take that further to those consequences, it expands into a giant web of a system. This could tighten up the lesson a bit- but I think it does depend on if the focus is on sustainability or on systems thinking.

put this with the key concepts bulleted list of terms and definitions.

this could be removed- 2nd para-is also covered below in the section- why systems thinking matters…. this would include the disclaimer statement.

What is the goal of this lesson? Is it about systems or is it about sustainability? I think it could be condensed a bit.

@pwirth why use a page note instead of just annotating at a heading to make a global comment?

this page looks great