There is now widespread concern that the Earth's climate will warm further, not only because of the lingering effects of the added carbon already in the system, but also because of further additions as human population continues to grow. Life on Earth has survived large climate changes in the past, but extinctions and major redistribution of species have been associated with many of them. When the human population was small and nomadic, a rise in sea level of a few metres would have had very little effect on Homo sapiens. With the current and growing global population, much of which is concentrated in coastal cities, such a rise in sea level would have a drastic effect on our complex society, especially if the climate were to change as suddenly as it has at times in the past. Equally, it seems likely that as warming continues some areas may experience less precipitation leading to drought. With both rising seas and increasing drought, pressure for human migration could result on a large scale. 
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For example, those who see a more frequent impact of scientific findings on land use regulations also tend to be more upbeat about the state of science today; 62% say this is generally a good time for science. By comparison, those who say the best science guides land use regulations only some of the time or never are less positive. Half (50%) of this group says it is a good time and an equal share says it is a bad time for science overall. The same pattern holds for each of the four types of regulations considered in the survey. Scientists who perceive a more frequent influence of the best science on regulations are also more likely to say this is a good time for science compared with scientists who see less frequent impact of the best scientific information on policy rules.