The United States ranks lower than 38 other countries on measurements of children's survival, health, education and nutrition - and every country in the world has levels of excess carbon emissions that will prevent younger generations from a healthy and sustainable future, according to a new report. The report, published in the medical journal The Lancet ... ranked 180 countries based on a "child flourishing index" and the United States came in at No. 39. Countries also were ranked by levels of excess carbon emissions - specifically researchers took a close look at estimated levels for 2030. Based on that data, the United States ranked No. 173 for sustainability. The year 2030 was selected as the threshold because in 2015 governments around the world adopted "Sustainable Development Goals" created by the United Nations to make improvements for people and the planet by 2030. Norway, South Korea and the Netherlands ranked in the top three, respectively, on current child "flourishing," but those countries were 156th, 166th and 160th, respectively, on the global sustainability index that measured carbon emissions, according to the report. Some countries had lower, yet still high, excess carbon emissions levels, but those countries did not rank well on the "child flourishing index" in the report. For instance, Burundi, Chad and Somalia ranked first, second and third on the sustainability rankings but 156th, 179th and 178th, respectively, on the "flourishing" rankings.