'Geneva Convention' needed to protect environment from war

"Although some positive outcomes can occur, such as when a vacated area becomes enriched with wildlife and vegetation, this is weighed against the destruction of social networks, systematic atrocities and the collapse of workable government. Future success after the conflict period may rely on natural resources and their careful management. Safeguarding natural resources in a conflict zone during the conflict itself makes sound social and economic sense for future stability."
- Dr Richard Pagett

"We also need to acknowledge that fighting occurs where resources are scarce due to over population, meaning we need sensible population policies. We must treat the environment and each other with more respect."
- Nick Reeves, CIWEM

Actually, the Geneva Conventions already does address the environment:

Methods or means of warfare that are intended or may be expected to case widespread, long-term and severe damage to the environment are prohibited.
- (Protocol I, Art. 35, Sec. 3)

Attacks against crops, livestock and agricultural areas needed for food production for the civilian population are prohibited. [...] Attacks against civilian drinking water installation and irrigation works are prohibited.
- ( Protocol I, Art. 54 , Sec. 2)

(Quotes from genevaconventions.org)