The burning of coal, oil, and other combustible energy sources produces carbon dioxide, a natural constituent of the atmosphere. Elevated levels of carbon dioxide are thought to be responsible for half the greenhouse effect. Enough carbon dioxide has been sent into the atmosphere already to cause a significant temperature increase. Growth in industrial production must be slowed, or production processes must be changed.
Which of the following, it true, would tend to weaken the strength of the above conclusion ?
The use of antibiotic is a very effective way of killing disease causing bacteria. some time people do not finish all of their pills. this can result in
