Bertha Vazquez has taught earth science for more than 25 years.
"For many years I covered the basic standard, probably like most people in the country do," she says.
Then one day, she says, she decided to throw that all out the window after seeing former Vice President Al Gore speak at the University of Miami at a screening of An Inconvenient Truth, his documentary about climate change.
"And it really ... hit me. This is 2007 and, I've got to tell you, I lost sleep," Vazquez says.