In 1910, farmers earned 40 cents for every dollar in sales. Today, they only earn a penny from each dollar, the result of a drastic consolidation of farm ownership centered on a few big commodity ...

On a grassy hill near where I met the ecologist Jennifer Dunne at the Smithsonian National Zoo, a lion craned its shaggy head back to watch a helicopter fly over. It was a stark illustration of humans ...

Estimated time of Completion: Activity and discussion can take up to 2 90-minute blocks depending on the amount of research Food webs show the interaction of different producers and consumers in an ...

If you want to understand an ecosystem, look at what the species within it eat. In studying food webs -- how animals and plants in a community are connected through their dietary preferences -- ...