Scientists expect that warmer temperatures in lakes and rivers will have an adverse effect on fish species. Although some species may thrive — indeed, some fish species populations are actually increasing — others potentially face extinction. Different species have different ranges of temperatures in which they're comfortable. Species that have large comfortable temperature ranges can adapt more easily than more sensitive species because they're not affected by these temperature shifts.
As the saying goes, you win some, you lose some. Unfortunately, climate change means the Earth will lose a lot. For example, the IPCC predicts that if global temperatures rise 2.3 to 3.1 degrees Fahrenheit (1.3 to 1.7 degrees Celsius) above 1850 levels — or 0.9 to 2.2 degrees Fahrenheit (0.5 to 0.9 degrees Celsius) above current levels — then North America will lose 8 to 16 percent of its freshwater fish habitat. This loss of habitat translates to a 9- to 18-percent loss of salmon.
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