Studies on mice showed that the plant reduced their fertility.
Iran says the 300-megawatt plant will provide electricity and reduce regular blackouts across the country.
They are one of the main ways plants reduce or avoid being eaten by herbivores.
The new plant would reduce river water intake to approximately 15 million gallons daily.
Saving the plants has also reduced expenses, she said.
But the law also includes a mandate that existing plants reduce emissions as much as 50 percent.
Oil prices are up, too, of course, but new nuclear plants would not reduce oil use significantly.
Green walls are found most often in urban environments where the plants reduce overall temperatures of the building.
But the new rule does not require all plants to reduce emissions by the same amount.
This plant is due to open in 2010 and will reduce the university's carbon emissions by over 30% on 1990 levels.