Word: oxygenate
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Those archaic plants prepared the way for the tetrapods. The plants created new aquatic habitats by stabilizing the banks of rivers and streams. They pumped oxygen into the atmosphere, making the earth habitable for large, air-breathing creatures. And they shed organic debris that formed the basis of a new food chain. Bacteria, fungi and small arthropods (the animal group that includes crustaceans and insects) moved in to feed on the debris; small fish moved in to eat the arthropods; bigger fish moved in to eat the small fish. Among them were the fishapod's lobe-finned ancestors, which found...
...such regions as Indonesia, the western U.S. and even inland Alaska have been increasing as timberlands and forest floors grow more parched. The blazes create a feedback loop of their own, pouring more carbon into the atmosphere and reducing the number of trees, which inhale CO2 and release oxygen...
...amount of carbon dioxide in the atmosphere is climbing fast. Most of it comes from burning fuels for energy--gasoline in cars or coal for electricity, for example. The U.S., with less than 5% of the world's population, produces one-quarter of all greenhouse gases BURNING FORESTS REDUCES OXYGEN AND INCREASES DROUGHT SPREADING THE PAIN Deforestation, through clear-cutting or burning, sows havoc far beyond the affected area. The fires release still more carbon into the atmosphere, fewer plants survive to convert CO2 into oxygen, and scorched soil absorbs more heat and retains less water, increasing droughts ?Plants...
NIGHTY NIGHT OXYGEN, WEDNESDAYS, 10 P.M. E.T.; RETURNS MARCH...
...climber shows symptoms he must descend in altitude immediately, which is difficult on the steep slopes of the “North Col,” Rennell said. Osborne said above 7,000 meters, the brain becomes “hypoxic,” or deprived of oxygen, making concentrating, breathing and sleeping difficult. Operating climbing gear at this state becomes difficult for inexperienced climbers. When asked what advice he would give students, Osborne said, “I would hate to look back at my life at forty and say there was something I wish I had done...