Science in Society Research the recycling centre that is closest to your home and find out the following:
1. Which items can be recycled there? 2. Is it free to recycle all items? If not, what items do you have to pay to recycle? 3. Are the materials recycled separately or together? 4. Find out what happens to four of the materials – are they recycled in Ireland? If not, where are they sent to? What are they reused as?
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5. Compare your findings with another student in your class. Combine your research to produce a single report or short PowerPoint presentation.
Case Study Bioplastics – A sustainable replacement for plastics?
Fig. 15 A biodegradable plastic bag.
Plastics are heavily relied upon in modern society but have a very significant impact on the environment. Bioplastics may provide a sustainable solution. Bioplastics are made from plants, using bacteria and other micro- organisms. The micro-organisms feed on the plant material and convert it into different substances, one of which is a plastic. Bioplastics are a more sustainable choice than traditional plastics because they are not sourced from crude oil and less
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Fig. 16 Biodegradable food wrapping.
carbon dioxide is produced in their manufacture. They are also a more sustainable choice because they are biodegradable - they break down into natural substances in as little as 45 days. However, they are currently more expensive. Bioplastics are being used to make bags, food packaging and disposable items such as cutlery and drinking straws. The main differences between bioplastics and traditional plastics are outlined in the following table:
