If you want to know what the weather's going to be like this weekend, ask a weatherman. If you want to know what it'll be like in 100 years, ask a scientist. The most important influence on the weather of the future is likely to be global warming. Global warming may or may not be the great environmental crisis of the next century. Here's what we know about global warming. Since the Industrial Age the concentration of the so - called greenhouse gases -carbon dioxide, methane and others in the atmosphere has risen about 30 percent. One opinion is that these tendencies are connected with industrial and transportation emissions that increased carbon dioxide, trapping more heat in the atmosphere and raising temperatures. Another opinion is that the small temperature rise is a natural climatic variation. Scientists say that the next hundred years the earth will heat up further. In 1995 hundreds of scientists from around the world predicted a rise of anywhere between 1.8 and 6.3 degrees by 2100. But some regions will become warmer and others, especially northern continents will become much warmer. The USA is facing a temperature rise of 5 to 10 degrees. We don't know what the effects of global warming might be.
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