Remember last March, when CO2 allegedly caused a lot of tornadoes? Now something else evidently caused March tornadoes to get off to "a very slow start"

March 2013's Slow Tornado Pace Could Change Soon - weather.com

March tornadoes are getting off to a very slow start this year, according to The Weather Channel's severe weather expert Dr. Greg Forbes. But it could all change soon.
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An EF-1 tornado hit in Glascock County, Ga. on March 5. Three homes and and a church were damaged. That tornado is the only confirmed tornado anywhere in the U.S. this month, making it the slowest start to tornado season since 2002.
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This year's March lull is dramatically different from the weather pattern one year ago. In 2012, a two-day severe weather outbreak March 2 and 3 produced 69 tornadoes, setting a dramatic pace that would end with more than 150 twisters for the month.