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A 4 degree world: Environmental impacts

A 4 degree world: Environmental impacts

Created by francisco on 24/11/2010
Updated on 15/06/2012
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SOURCE: Foreign and Commonwealth Office
A 4 degree world
This interactive map shows some of the possible impacts of a global temperature rise of 4 degrees Celsius.
It underlines why the UK Government and other countries believe we must keep global warming to 2 degrees Celsius, because beyond that the impacts will be increasingly disruptive to our global prosperity and security.
The impacts shown on the map are only a selection of those that may occur and are focused primarily on the effect of climate change on human activity. Where numbers of people are quoted, the underlying assumption is that population changes will follow the population projections used by the IPCC to develop the A1B emission scenario. This means that the impacts are consistent with each other.
However, the evidence for the impacts shown comes from a number of different research studies. In some cases the impacts have been driven by different model projections, although all the climate data used is consistent with a 4 ºC (7 ºF) global average-temperature rise.

Adaptation options to the impacts shown on the map may or may not always be feasible. For this reason no assumptions are made about the adaptive capacity of the countries and regions affected. Instead, the values described as 'up to' indicate the worst case in a range of outcomes that include model uncertainty and behavioural responses.

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