Today in Washington, D.C. we got our first taste of fall. It was crisp and in the low 60s. And just as we slide into the last days of summer in the Northern Hemisphere, the National Oceanic and Atmospheric Administration published its summer 2012 recap.
It's exactly what you were expecting: It was really hot. In fact, 2012 was the third hottest on record.
Reducing greenhouse gases and saving the polar bears tend to dominate discussions on climate change. But to the booming world population, one climate change issue may be even more pressing – hunger.
A new report by a leading international relief agency warns that climate change will increase the risk of large spikes in global food prices in the future, and lead to more hungry people in the world. That's because extreme weather like droughts, floods and heat waves are predicted to become much more frequent as the planet heats up.
Check out this graph of America's "Growing Season" — it measures the number of continuous days and nights when it never gets below 32 degrees. You could call this our "frost-free" time of year. In many places, the frost-free season begins in the spring and ends somewhere in October.
As you can see, over the 20th century, it's been staying frost-free longer...and longer...and longer...