Unsustainability in production pattern is due to which of the following?<br/>1. Heavy dependence on fossil fuels<br/>2. Limited availability of resources<br/>3. Expansion of recycling<br/><br/>Select the correct answer using the code given below.

1. Heavy dependence on fossil fuels — Fossil-fuel-based production causes pollution, emissions and resource depletion, so it makes production patterns unsustainable. Verdict: Correct.

2. Limited availability of resources — Natural resources are finite; overuse of limited resources makes long-term production unsustainable. Verdict: Correct.

3. Expansion of recycling — Recycling improves resource efficiency and reduces waste; it supports sustainability rather than causing unsustainability. Verdict: Incorrect.

Hence, 1 and 2 only are correct.