Final answer:
One widely believed barrier to world peace is the human penchant for blaming and demonizing others based on different beliefs about the supernatural. This can lead to violent conflicts between people holding different beliefs, as well as conflicts arising from disagreements and scarcity of resources.
Step-by-step explanation:
One widely believed barrier to world peace is the human penchant for blaming and demonizing others, based on different beliefs about the supernatural.
This can lead to violent conflicts between people holding different beliefs. Such conflicts can arise from disagreements and scarcity of resources, including clean air, potable water, food, and shelter.
Additionally, national and international grievances, competing ideologies, and economic self-interest can contribute to the breakdown of peace and the rise of conflicts.