Word: oxygen
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...electricity from renewable sources. Current from wind, solar or geothermal energy can be used to extract hydrogen from water molecules. In the future, hydrogen could be stored in tanks, and when energy is needed, the gas could be run through a fuel cell, a device that combines hydrogen with oxygen. The result: pollution-free electricity, with water as the only by-product. Already fuel-cell buses, cars and small generators are being tested. Eventually, some visionaries say, fuel cells placed in individual buildings could replace many of today's giant electric plants. But that will not happen unless the technology...
...fire dies when it is deprived of fuel, heat or oxygen. The main strategy for fighting wildfires is containment: surround the fire and starve...
...worry. The snakehead can exceed 3 ft. in length and will eat pretty much anything that can fit into its jaws. What's more, the Patuxent River is only 75 yds. away, and the fish--with an air sac in its digestive system that allows it to absorb oxygen, and the ability to flop its way across small stretches of muddy land--could soon wriggle into the nation's waterways...
...Fuel means flammable solids--grass, pine needles, undergrowth, smaller trees--that, with oxygen, feed the fire...
...Then cooler air rushes in to fill the void --Fresh air rushes in, bringing more oxygen to fuel the flames...