Mounting evidence suggests humans are now a major driving force of evolution on Earth. From selective breeding to environmental modifications, we're altering so much of our world that we're not only now driving the climate, but the direction of life
Now, in a massive project involving 287 scientists across 160 cities in 26 countries, researchers examined how urbanization has influenced evolution on a global scale. They used white clover as a model – a plant native to Europe and west Asia, but found in cities all around the world.
Collecting more than 110,000 samples along gradients that extended from the cities, through suburbs and out to the country, they found that clover in cities is now more similar to clover in another city a world away than it is to that found in nearby farmland or forests, regardless of climate. "We just showed this happens, often in similar ways, on a global scale," said UTM ecologist James Santangelo.
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