By Dan Shapley
Wade into the voluminous scientific research about climate change, and you'll stumble quickly on the phrase "positive feedback loop" -- a fancy way of saying "downward spiral." The worsening of one thing makes a second thing worse, which makes the first thing worse still. A new U.N. report highlights the concern about such a positive feedback loop between global warming. Global warming melts ice, which replaces ice's white reflectivity with sun-absorbent darkness, which increases the rate of warming on the Earth's surface. The new part is that this process is happening faster than scientists had previously predicted. Concerns are growing that the window of opportunity during which we can prevent the most dangerous aspects of climate change is narrowing, according to a story in the June 6 Newsday. Track the weirdest weather events and submit your photos to The Daily Green photoblog, Weird Weather Watch. What Can You Do? See The Daily Green's daily feature, One Easy Thing, for daily tips -- like reducing your carbon footprint.