What is also known as the "world's largest pharmacy" -- a place where indigenous groups are using drones to keep tabs on illegal activity?

Amazon Rainforest

Explanation:

The Amazon Rainforest of South America is the largest rainforest in the world and is usually called Earth's lungs due to the large amount of oxygen it releases and the large amount of carbon dioxide it removes from the atmosphere and stores.

The Amazon has another name though which is the Worlds Largest Pharmacy. This is because the abundance of flora in the Amazon provide so many herbs that can be used as natural medicine.

Indigenous groups use drones in the Amazon to track places where people are engaging in illegal logging in efforts to protect the forest.

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