Despite being an obvious source of carbon emissions, cremation also has environmental advantages over burial, depending on local practice. Studies by Elisabeth Keijzer for the Netherlands Organisation for Applied Research found that cremation has less of an environmental impact than a traditional burial (the study did not address natural burials), while the newer method of alkaline hydrolysis (sometimes called "green cremation" or "resomation") had less impact than both. The study was based on Dutch practice; American crematoria are more likely to emit mercury, but are less likely to burn hardwood coffins. Keijzer's studies also found that a cremation or burial accounts for only about a quarter of a funeral's environmental impact; the carbon emissions of people travelling to the funeral are far greater.