Some experts suggest that the next world war will be fought over

A) fresh water.
B) oil and gas.
C) environmental policies.
D) pollution.

Fresh water is a finite resource that is becoming scarcer due to population growth, climate change, and pollution. As demand for water increases, competition for access to water may become a source of conflict between nations, potentially leading to a global war. While oil and gas have historically been sources of geopolitical tension, advances in renewable energy and alternative fuels mean that fresh water is now the more pressing concern. Environmental policies and pollution are also important issues, but are less likely to lead to a large-scale conflict.