Artificial Intelligence
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Zalasiewicz et al. (2016) estimate that the total amount of plastic generated in 2015 was of the order of… . 1. 5 million tons 2. 50 000 tons 3. 5 billion tons 4. 500 000 tons

Zalasiewicz et al. (2016) estimate that the total amount of plastic generated in 2015 was of the order of **5 billion tons**. Therefore, the correct answer is **3. 5 billion tons**.