As climates change due to global warming, the ideal breeding ground for many bird species are shifting northward. This means that birds will have to increase the length of their migrations, flying further north to reach the place where they raise their young. For some birds this is already happening, and more and more birds are likely to begin shifting their migrations as global warming continues. Longer migration distances will mean birds have to expend more energy on their journey, leading to increased stress and increasing the dangers of the migration. The sooner we drastically curb greenhouse gas emissions around the world and stabilize the global climate, the easier it will be for hundreds of migratory bird species.
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