It's a gas! Air consists of nitrogen and oxygen and lots of empty space.
Scientists are engineering a method for turning solar energy into fuel.
Birds and many reptiles evolved a specialized way of breathing—one-way air flow.
Global warming has created a feedback loop, wherein Arctic sunlight converts thawing ice into more CO2.
Following the Permian mass extinction, the surviving species rapidly diversified.
Climate change isn't just about rising tides overtaking land; climate change may destroy vast oceanic ecosystems.
Climate change may not only devastate food crops, but also diminish plants' nutritional value.
Plankton aren't just the foundation of the ocean's food chain; they're also really important for getting carbon dioxide out of the air.
55 million years ago, as the Earth heated up, many mammal species got smaller. Could the same thing happen again with human-induced global climate change?
Scientists and University of Colorado, Boulder may have come up with a way to make hydrogen fuel cleaner.