The spread threatens to smother vegetation that is a source of food for a variety of animals, raising concerns about the stability of the ecosystem's food chain.
The cross-party committee warned that the increased use of biofuels, part of the European Union's demand for greater stability in energy, would drive up the cost of food.
In its 2011 Annual Global Risks Report, the WEF warned the world's economy could not withstand any further shocks to the system and identified 37 main threats to its future stability, from crippling government debt and cyber security, to unsustainable pressure on resources and food security.