Read the following passages and answer the items that follow the passages. Your answers to these items should be based on the passages only.
The main threat to maintaining progress in human development comes from the increasingly evident unsustainability of production and consumption patterns. Current production models rely heavily on fossil fuels. We now know that this is unsustainable because the resources are finite. The close link between economic growth and greenhouse gas emissions needs to be severed for human development to become truly sustainable. Some developed countries have begun to alleviate the worst effects by expanding recycling and investing in public transport and infra-structure. But most developing countries are hampered by the high costs and low availability of clean energy sources. Developed countries need to support developing countries' transition to sustainable human development.
Unsustainability in production pattern is due to which of the following ?
1. Heavy dependence on fossil fuels
2. Limited availability of resources
3. Expansion of recycling
Select the correct answer using the code given below.