Every year dozens of studies try to answer this simple question: Does it cost more to build green? And each study seems to come up with a different answer. We can accurately quantify everything. We know that ants are 33 percent of the terrestrial animal biomass on earth. We know that Shakespeare used 34,314 words to write “King Lear.” And we also know that a typical teenage boy in the United States gets 10 percent of his daily calories from soda. So why can’t everyone agree on what the cost is to build green?