The biggest drawback to building green is
saving the environment
having to use green paint
the up front cost
the aesthetics of the new building

The biggest drawback to building green is the up front cost.

So the answer to this question is illustrated in the third option, stating "the up front cost". With the expensive and luxurious price tags on these green products lead users and consumers to believe that they become impractical. 

light dependent reactions:

release oxygen during the photolysis of wateroccur in the granaproduce atp

light independent reactions:

fix carbon dioxide occur in the stromaproduce glucose

hope this !