Government is a group of people who rule or run the administration of a country. In other words, it may be said that a government is the body of representatives that governs and controls the state at a given time. Government is the medium through which the power of the state is employed.

Governance is the act of governing or ruling. It is the set of rules and laws framed by the government that are to be implemented through the representatives of the state. Simply put, governance is what governments do.

Governance is a concept that can be followed in an organization of any size, be it a single cell or an organism or all of humanity. Governance may function variously for profit or non-profit, for people, or itself. The main purpose of governance is to assure good results following a set pattern of rules.

Sustainable land use enables people to thrive within nature's limits; it includes social, environmental, economic and cultural objectives into policy and practice for the long-term well-being of communities and ecosystems.

If demand of water more than supply of water, water is going to quickly become a limiting factor in our lifetimes. Drop in quantity and quality of water will cause problem in having freshwater. This will further cause drought, affect rice and food crop production. 
Eventually there will be not enough food for humans and animals.