Word: rain
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Given its weight and power source, the Solar Impulse design can't handle turbulence, rain or even heavy clouds. During the day the HB-SIA is expected to climb to 28,000 ft. (8,500 m) so it can preserve battery power after sunset by gliding down to 10,000 ft. (3,000 m) at night. For as much as one-third of the night, says Piccard, the plane will be able to fly its descending course without engine power. But once it reaches its nighttime cruising altitude, the burden of powering the plane will fall to the batteries alone...
...bring us to ruin. Fossil fuels - coal, oil, and natural gas - have powered economic development for two centuries, and without them we'd all be stuck in poverty. But we've learned step by step of harmful side effects. First we learned that coal-fired power plants created acid rain, so we changed the rules of the game to insist on smokestack scrubbers to eliminate pollutants like sulfur oxides. Second we learned that automobiles produced pollutants that caused smog, so we changed the rules to insist on catalytic converters. Now we've learned that the carbon dioxide produced by burning...
There is a difference, however, between the problems of carbon dioxide emissions and those of acid rain or smog. The carbon dioxide emitted by power plants, automobiles, steel mills and home furnaces doesn't just affect our local environment or the lakes and forests a few hundred miles downwind; it accumulates in the atmosphere and affects the entire planet. U.S. emissions are changing the climate in Africa and Asia, just as the soaring emissions of China are affecting America's climate. The results are already deadly, causing failed crops in Africa, killer heat waves in Europe, extreme droughts...
Everyone wants to help the environment. And Alaska has a lot of environment to give. In the face of deforestation, global warming, and acid rain, we need to stand strong to protect our wilderness heritage. We must unite for the environment—unite around Alaska...
...stunning. Visitors descend into the former clay hole, now landscaped and studded with native vegetation, to arrive at the main attraction: two honeycombed domes, shaped like grapefruit halves, bubbling up from the base. These are the biomes, giant greenhouses that shelter the flora and mimic the climate of tropical rain forests and Mediterranean farms. Enter the humid and heated rain-forest biome on a drizzly Cornish day, and you'll soon break a sweat worthy of Singapore...