Global warming and the greenhouse effect may not be all that human beings need to worry about. Environmentalists predict that climate change over the next 50 years will shift the current balance of ecosystems and bring new predators and prey closer together. This shift may not cause vast extinction of species, but it will most probably cause unbalanced distributions of predators and prey throughout the world. Such an altered distribution of animal species will affect humans in unpredictable ways.

The author of this selection probably feels that climate changes in the next 50 years

may have ill effects on humans.

Explanation

The last sentence of the selection states that such changes in climate will affect humans in “unpredictable ways.” Thus, you may infer that these changes could be negative ones.

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