Plastic ground foil keeps weeds at bay and protects crops from dirt. But it needs to be replaced regularly and is not biodegradable. Chemists are developing a biodegradable alternative based on cellulose that is simply sprayed onto the ground.
One is natural, grown locally and must be bought every year. The other is made of plastic, but can be used again and again. Which is more environmentally sustainable: a real or an artificial Christmas tree?
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