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While overpopulation locally leads to rural flight, this is more than counterbalanced by accelerating urbanization and urban sprawl. Theories like the world-system theory and the Gaia hypothesis focus on the inter-dependency aspect of environmental and economic issues. Among the most evident environmental problems are: [5] [6] [7] [8]
Wicked problem. In planning and policy, a wicked problem is a problem that is difficult or impossible to solve because of incomplete, contradictory, and changing requirements that are often difficult to recognize. It refers to an idea or problem that cannot be fixed, where there is no single solution to the problem; and "wicked" denotes ...
List of cognitive biases. Cognitive biases are systematic patterns of deviation from norm and/or rationality in judgment. They are often studied in psychology, sociology and behavioral economics. [1] Although the reality of most of these biases is confirmed by reproducible research, [2][3] there are often controversies about how to classify ...
Word problem (mathematics education) In science education, a word problem is a mathematical exercise (such as in a textbook, worksheet, or exam) where significant background information on the problem is presented in ordinary language rather than in mathematical notation. As most word problems involve a narrative of some sort, they are ...
A social issue is a problem that affects many people within a society. It is a group of common problems in present-day society that many people strive to solve. It is often the consequence of factors extending beyond an individual's control. Social issues are the source of conflicting opinions on the grounds of what is perceived as morally ...
The problem of universals refers to the question of whether properties exist, and if so, what they are. [25] Properties are qualities or relations or names that two or more entities have in common. [26] The various kinds of properties, such as qualities and relations, are referred to as universals.
Base rate fallacy – making a probability judgment based on conditional probabilities, without taking into account the effect of prior probabilities. [6] Conjunction fallacy – the assumption that an outcome simultaneously satisfying multiple conditions is more probable than an outcome satisfying a single one of them.
This is a list of some of the more commonly known problems that are NP-complete when expressed as decision problems. As there are thousands of such problems known, this list is in no way comprehensive. Many problems of this type can be found in Garey & Johnson (1979).