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Alberta's leader is in Washington to lobby Congress and the Obama administration to push ahead with the controversial pipeline.

A video from NASA shows how air pollution moves around the world. So what happens when emissions from Asia blow across the Pacific Ocean to North America?

Why does that sleek polyester T-shirt reek after 10 minutes, while the old-school cotton stays relatively sweet? Polyester attracts very different microbes, which may account for that special stink.

Citing growing evidence that no amount of lead exposure is safe for kids, the American Academy of Pediatrics has called for tighter regulations on the amount of lead in house dust, water and soil.

Scientists have answered a burning question central to the charm of sunflowers: Why do young flowers move their blooms to always face the sun over the course of a day?

It's the largest city in the U.S. to commit to using only renewable energy. And even though stakeholders are on board, trouble could be brewing over how to implement the plan.

Despite America's high coffee consumption, Keurig reported disappointing sales this week. Even during its popular holiday selling period, the numbers haven't perked up in recent years.

Even before he officially unveiled it, President Obama's plan to cut the carbon pollution produced by power plants faced significant opposition.

Using divers to monitor whether life is returning to the 100 or so marine protected areas is pricey. Now, advances in DNA sequencing mean scientists just need a seawater sample to do a marine census.

President Obama used an executive order to start a program intended to help farmers and ranchers cope with weather changes that have begun to alter growing seasons and crop health.