In the late 70 s , only about 18 adults were obese . That figure has tripled . That ' s not taking into consideration the fact that the BMI metric underestimates obesity rates in populations , compared to body fat percentages . So the obesity rate is even higher . Fats make me want to puke . <| sep |> They ' ve got to buy the land or rent it . That much investment in solar will change the price . Just because there are many strike prices above 9 p , doesn ' t mean the solar panels would be able to produce it . At that level too you have to worry about the spread between your obligation to sell , and what you can actually generate because it ' s a lot cloudier today . If it was that easy to make money doing it . Someone would be doing it . So why aren ' t they ? Is it just the lack of land ? Is it the worry that PVs will fall in price so much so that someone else will come in and underbid you ?