"Clashes of values and the struggle for primacy constitute a constant in human history that accounts for that other constant - conflict and war."

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When resources are degraded, we start competing for them, whether it is at the local level in Kenya, where we had tribal clashes over land and water, or at the global level, where we are fighting over water, oil, and minerals. So one way to promote peace is to promote sustainable management and equitable distribution of resources.

— Wangari Maathai