Why is this incorrect? According to Pimental Cold Heart is correct. According so some other studies at places like Berkley he's not right, but the environazis at Berkeley are more likely to make the experiment fit the desired outcome than Pimental.
That old report has been throroughly debunked. Not only that, it does not even come close to present data nor what present research indicates will be obtainable in 3 to 5 years.