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Glossary of Terms

Sea Level Rise

Sea level rise is affected by primarily two factors – polar ice melt, and thermal expansion. Over the earth’s history, sea level rise and fall has been a natural phenomena connected to changes in the hydrologic cycle. During the 20th century, however, it began to be affected by climate change. Early in the 21st century, the IPCC reports found that if greenhouse gas emissions were not significantly reduced, sea level rise could reach as high as forty feet. Since almost two-thirds of the world’s population lives in coastal areas, this could cause major displacement.
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“We have a very brief window of opportunity to deal with climate change… no longer than a decade at most.”
- James Hansen, NASA climate researcher
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