Last year, the Obama administration canceled plans to make Yucca Mountain the permanent storage site for the nation's nuclear waste. The half-built site is seen here in a file photo from 2006. Isaac Breekken/AP hide caption

itoggle caption Isaac Breekken/AP

This image provided by NASA taken early Friday morning Nov. 5, 2010 shows Hurricane Tomas approximately 175 miles west of Port-au-Prince, Haiti, and moving northeast near 9 mph. Tomas strengthened to a Category One Hurricane overnight with maximum sustained winds now at 80 mph with higher gusts.  NASA hide caption

itoggle caption NASA

A trail camera captures the mountain lion during its journey from west to east. Courtesy of Connecticut Dept. of Energy & Environmental Protection hide caption

itoggle caption Courtesy of Connecticut Dept. of Energy & Environmental Protection

Lake Tahoe's South Shore as seen from a ski resort's gondola. Brandon Rittiman for NPR hide caption

itoggle caption Brandon Rittiman for NPR

Extremely hot days are prime for bad air because hydrocarbons evaporate into the air, helping to create ozone. Ramin Talaie/Getty Images hide caption

itoggle caption Ramin Talaie/Getty Images