The Weizmann Institute of Science reports that a new method of studying atmospheric pollution levels has been discovered. Instead of the laborious process of studying ice cores and tree rings, scientists have confirmed that the study of paper may be more efficient. The ratio of two types of carbon isotopes taken from old papers and magazine create a better comparison of climate changes. Isotope concentrations have changed over time and the industrial burning of oil, gas and coal altered the chemical composition of the atmosphere. Atmospheric changes have been reflected in tree rings and are now evident in paper generated from the trees. Dan Yakir, of the Weizman Institute, launched this study 14 years ago and has tracked atmospheric carbon dioxide from the burning of fossil fuels. Fastcast: Stuffy.

Isolated showers and thunderstorms after 3 p.m. Mostly sunny and hot, with a high near 97 degrees. Heat index values as high as 107 degrees. Calm wind becoming east around 5 mph. Chance of precipitation is 10 percent. Tonight, isolated showers and thunderstorms before 7 p.m. Partly cloudy, with a low about 77 degrees. South wind around 5 mph becoming calm. Chance of precipitation is 10 percent.