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Answer:
The expression "carry a bucket" is used by the author to convey the sense of work and responsibility. This is connected to the theme of history as it shows that taking care of plants correctly requires a lot of work and responsibility.
Step-by-step explanation:
"Allied with green" is a story whose main theme is to show the importance of nature and especially plants in the life of humanity and how this importance requires everyone to commit to caring for nature and not destroying it. History shows how green plants are the element that literally allows life to continue, being the providers of the most necessary resources for the maintenance of living beings. Although it is very laborious to take care of these plants, everyone must dedicate themselves to this, taking care of nature responsibly and allowing for a livable future.