The document discusses four core asset classes - land, water, food, and energy - that can help preserve wealth in the face of threats from population growth, climate change, and resource scarcity. It recommends a two-pronged approach: 1) investing directly or indirectly in companies related to these assets, and 2) using personal wealth to purchase enough of these core resources so that families can become self-sustained. Specifically, owning fertile land provides opportunities to access water, produce food, and generate energy on-site. Wealthy families can purchase remote land with these resources to serve as a safe haven.