Whether we like it or not, global climate change will have pronounced effects on the world we live in. Oddly enough, climate change brings with it some minor positive effects. For instance, the frost-free growing season will lengthen. This means that farmers will have a longer period of time in which to grow crops. Ultimately, some farmers may be able to plant and harvest two crops per year, rather than just one. But for every positive effect, there are ten negative ones. Temperatures will continue to rise. Of course, this could spell the doom for polar ice caps. Climate change also brings with it changes in precipitation patterns. More precipitation is expected for the northern U.S., while much less is expected for the Southwest. But perhaps more than anything else, climate change could devastate our coastal cities. Experts estimate that sea levels will rise one to four feet within the next sixty years. So, while not all of the results of climate change are negative, we clearly stand to lose more than we gain.
What is the main idea of the passage?

Question

Quizplus · Accepted Answer

The author describes one possible positive effect of climate change (longer growing seasons), but the rest of the effects are all negative.
The effects of climate change will not be seriously felt for another sixty years is incorrect. The author states that sea levels could rise between one and four feet within sixty years. Clearly, the effects of climate change will be felt long before then. 
Climate change will not negatively affect the farmers in the United States is incorrect. The author states that some farmers will be able to plant two successive crops a year. However, since the Southwest will be drier than usual, farmers in that region could experience drought. 
It is time to prepare coastal cities in the U.S. for upcoming floods is incorrect.  The author does not make any call to action, suggesting that cities be prepared for upcoming floods.

Whether We Like It or Not, Global Climate Change Will