Meaning: Indifference means a lack of interest, concern, or sympathy, indicating that people are not paying attention to environmental issues.

Wrong options:

• response: Response implies an action taken in reaction to something, which does not convey the lack of concern needed in this context.
• dedication: Dedication suggests a strong commitment or devotion, which contradicts the idea of neglecting environmental issues.
• commitment: Commitment indicates a promise or dedication to a cause, which is opposite to the notion of indifference.

Correct answer: proactive

Explanation: The word 'proactive' is an adjective that describes taking initiative and acting in anticipation of future problems, which is essential in the context of urgent action needed for environmental protection.

Meaning: Proactive means taking action by causing change rather than responding to it after it has happened, emphasizing the urgency of addressing environmental issues.

Wrong options:

• reactive: Reactive means responding to events after they happen, which is not suitable when immediate action is required.
• hesitant: Hesitant implies uncertainty or reluctance, which does not convey the urgency needed for environmental action.
• immediate: Immediate suggests urgency but lacks the proactive aspect of taking initiative before issues arise.

Correct answer: alternatives

Explanation: The word 'alternatives' fits as a noun that refers to options or substitutes, which is contextually appropriate when discussing the need for different materials instead of single-use plastics.

Meaning: Alternatives refer to other choices or options that can be used instead of something else, in this case, different materials to replace plastics.

Wrong options:

• consumption: Consumption refers to the act of using something, which does not fit the context of finding substitutes for plastics.
• grades: Grades typically refer to levels or classifications, which is irrelevant in the context of discussing materials to replace plastics.
• effectiveness: Effectiveness relates to how well something works, which does not align with the need for alternative materials.

Correct answer: collectively

Explanation: The term 'collectively' is an adverb that indicates action taken together by a group, which is essential in the context of reducing dependence on fossil fuels and promoting sustainable practices.

Meaning: Collectively means acting together as a group, emphasizing the importance of collaboration in addressing environmental issues.

Wrong options:

• relatively: Relatively means in relation to something else, which does not convey the idea of joint action needed in this context.
• selectively: Selectively implies choosing specific items or actions, which does not fit the need for a unified approach to environmental issues.
• productively: Productively suggests effectiveness in achieving results, but does not emphasize the collaborative aspect required for environmental action.