East Boston was once home to a massive waterfront park the size of nearly 40 football fields called Wood Island, a sparkling jewel in Frederick Law Olmsted’s Emerald Necklace. But in the 1960s, officials razed the park to make way for Logan Airport’s expansion. Morning Edition co-host Jeremy Siegel has been looking at how that decision has led to immense health disparities in Eastie, including higher rates of cancer, asthma and obesity.