Word: keeps
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Dates: during 1990-1999
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...that unfortunate? After all, these fuels provide nearly 80% of the energy humans use to keep warm, to light buildings and run computers, to power the cars that get us around, the tractors that plant food, the hospitals that serve our sick. If these fuels were to vanish tomorrow, worldwide chaos would follow and humans would die in the hundreds of millions...
Here's what we know. Since sunlight is always falling on the earth, the laws of physics decree that the planet has to radiate the same amount of energy back into space to keep the books balanced. The earth does this by sending infrared radiation out through the atmosphere, where an array of molecules (the best known is carbon dioxide) form a kind of blanket, holding outgoing radiation for a while and warming the surface. The molecules are similar to the glass in a greenhouse, which is why the warming process is called the greenhouse effect...
TODAY: Bypasses, angioplasty and transplants to keep blood flowing to the heart muscle. Doctors are beginning to use gene therapy to grow new blood vessels...
...apartments [1], telecommuting with our computers. Others will make a short hop to a nearby office park [2]. Those who have to go downtown will prefer swift mass transit [3]. Cars and trucks [4] will still be used, but they will run on clean, hydrogen-powered fuel cells. To keep ourselves in shape and save money, we'll spend more time on bicycles...
...gaining weight in the 21st century. Which means more and more people can expect to hear the antifat refrains that I've become so familiar with: "You won't live as long," "Your quality of life will be diminished," "Society will reject you," "You won't be able to keep up in the protest marches." (That was just in my family.) Let's take these one at a time...