Final answer:
The use of plastic for bicycle helmets can decrease resources for other industries (option 1), increase carbon emissions, and potentially reduce production costs if new types of plastics become available.
Step-by-step explanation:
The use of plastic to produce bicycle helmets has a direct impact on plastic-using industries in several ways. If the production of bicycle helmets leads to an increase in the demand for plastics, this could in turn decrease the amount of resources available to other industries that use plastic, potentially leading to higher costs for those industries.
Additionally, if the demand for plastics increases due to the production of bicycle helmets, this could lead to increased carbon emissions tied to higher levels of plastic production, which has an impact on global warming.
Conversely, the innovation or increased use of certain types of plastics, like a new popular kind made from oil, could lead to a greater availability of that specific type of plastic in the market which might reduce production costs for industries using those materials.