water quality How Climate Change Is Affecting Nature's Water Purification System By Tana Weingartner • Oct 30, 2017 Andrew Tucker / Miami University Listen Listening... / 1:01 Ultraviolet light is nature's way of purifying lakes, rivers and coastal waterways. Researchers led by a Miami University professor are quantifying how climate change is negatively affecting nature's ability to do its job. Warmer Lakes Lead To Toxic Algae Increases, Study Finds By Tana Weingartner • Jan 12, 2016 Provided / O’Reilly et al. Geophys. Res. Lett., 42, doi:10.1002/2015GL066235 Rapidly warming surface water temperatures in lakes around the world are threatening freshwater supplies and ecosystems. That's according to a 25-year study of 235 lakes on six continents.