Moreover, if and where additional land for biofuel production goes at the expense of naturally vegetated land, this will affect the hydrological cycle. Additional water stress can result on irrigated land, and this competition over water between food and fuel crops can affect agricultural production in drought-prone regions and potentially lead to yield reductions. Currently around 33% of the earth’s surface (excluding Greenland and Antarctica) is used for crops and livestock farming (PBL, RIO+20). Projections indicate that agricultural land use is likely to increase even further in coming decades due to population and welfare growth.