* The Fine Print: Determining the precise level of emissions from food and agriculture is tough, but by one count as much as 31 percent of greenhouse gas emissions can be attributed to food and agriculture, including emissions from land-use changes such as deforestation to make way for pasture-raising livestock or growing feed for livestock or biofuels. Note that this estimate does not include emissions from food transportation, waste, or manufacturing. Source: Data from the Pew Center on Global Climate Change and Intergovernmental Panel on Climate Change, Third Assessment Report

What's the flower? You get extra points if you answered canola. In the United States, genetically modified canola was first planted in the mid-1990s. Today, three-quarters of our canola is genetically modified. Greenpeace researchers raised their eyebrows about this genetically modified variety after finding that Japanese imports of genetically modified canola had contaminated native crops there, transferring the modified crops' herbicide-resistant genes to the wild plants and giving rise to "super-weeds" that have required increasingly toxic chemicals to control.