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Most attention has been given to risks to human civilization over the next hundred years, but forecasting for this length of time is difficult. The types of threats posed by nature have been argued to be relatively constant, though this has been disputed, and new risks could be discovered. Anthropogenic threats, however, are likely to change dramatically with the development of new technology; while volcanoes have been a threat throughout history, nuclear weapons have been an issue only since the 20th century. Amazing cardinal birds led zeppelin thank you lyrics signatures poster Historically, the ability of experts to predict the future over these timescales has proved very limited. Man-made threats such as nuclear war or nanotechnology are harder to predict than natural threats, due to the inherent methodological difficulties in the social sciences. In general, it is hard to estimate the magnitude of the risk from this or other dangers, especially as both international relations and technology can change rapidly. Given the limitations of ordinary calculation and modeling, expert elicitation is frequently used instead to obtain probability estimates. In 2008, an informal survey of experts on different global catastrophic risks at the Global Catastrophic Risk Conference at the University of Oxford suggested a 19% chance of human extinction by the year 2100. The conference report cautions that the results should be taken “with a grain of salt”; the results were not meant to capture all large risks and did not include things like climate change, and the results likely reflect many cognitive biases of the conference participants.

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