For GSS Climate Change chapter 8. Excerpt: A NASA-led team of scientists has uncovered strong evidence that soot from a rapidly industrializing Europe caused the abrupt retreat of mountain glaciers in the European Alps that began in the 1860s, a period often thought of as the end of the Little Ice Age.... http://www.nasa.gov/press/2013/september/nasa-led-study-reveals-industrial-soots-role-in-1800s-glacier-retreat/  NASA RELEASE 13-273.