From the tornadoes in Joplin, to a record drought in Texas and the floods in Mississippi, and giant earthquakes off the coast of Japan, why is the Spring of 2011 so terrifying and terrible? Is our environment really getting scarier, or is it just our short-term memory?  Professor Katharine Hayhoe is an atmospheric scientist at Texas Tech University and author of "A Climate for Change: Global Warming Facts for Faith-Based Decisions." She says our unpredictable spring is part of climate change and that Spring is coming earlier and earlier each year.