Hi, I liken this to the sentiment '
with great responsibility comes great power' :)
At level 5 you'll find times where your experience enables you to make sourcing, purchasing and usage suggestions for colleagues and the setting.
Where those resources come from have an impact - on the environment via the item's raw materials, on health and safety and the potential for harm in the setting, and opportunities for learning - what a toy/activity offers in terms of supporting children's outcomes & potential V it's cost and expected life.
Being able to justify the reasons as to how you manage physical resources eg. equipment, tools, art & craft items, plants, food, helps you comply with legislation, evidence your duty of care & protect the worldwide environment :)
On a side note,
The trouble with dragons is a cool children's storybook that examines sustainability and the resources used in a fiery world!
Hth xx