Water saving through trade - example
USA
Water footprint rice = 1200m3/ton
Water footprint rice = 1200m3/ton
Mexico
Water footprint rice = 2000m3/ton
Water footprint rice = 2000m3/ton
Rice trade
T = 500,000 ton/yr
T = 500,000 ton/yr
National water loss
= 1200 × 500,000
= 600 million m3/yr
= 1200 × 500,000
= 600 million m3/yr
National water loss
= (2000-1200) × 500,000
= 400 million m3/yr
= (2000-1200) × 500,000
= 400 million m3/yr
National water saving
= 2000 × 500,000
= 1 billion m3/yr
= 2000 × 500,000
= 1 billion m3/yr
[Source: Hoekstra & Chapagain, 2008]