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sea level
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Sea level
How do satellites help measure sea levels?
Global sea level change Global average sea level change changes in global average surface temperature and sea level and Northern Hemisphere snow cover
How greenhouse gases affect Earth's climate
How is sea level measured?
What would happen if Earth's temperature rose by 2 °C?
For Students
Combination shot of Grinnell Glacier taken from the summit of Mount Gould, Glacier National Park, Montana in the years 1938, 1981, 1998 and 2006.
Pop Quiz: 18 Things to Know About Global Warming
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Videos

How do satellites help measure sea levels?
Learn how sea level is measured.
Video: Contunico © ZDF Studios GmbH, Mainz
How greenhouse gases affect Earth's climate
An overview of the role greenhouse gases play in modifying Earth's climate.
Video: Encyclopædia Britannica, Inc.
How is sea level measured?
The people who figure this out are called “geodesists.”
Video: © MinutePhysics (A Britannica Publishing Partner)
What would happen if Earth's temperature rose by 2 °C?
Overview of the impact on Earth of an increase in global average temperature.
Video: Encyclopædia Britannica, Inc.

Images

Sea level
Roadside sea level marker between Jerusalem and the Dead Sea, Israel.
Berthold Werner
Global sea level change
Change in sea surface height from 1993 to 2008, according to data collected from...
NASA/JPL
changes in global average surface temperature and sea level and Northern Hemisphere snow cover
During the second half of the 20th century and early part of the 21st century, global...
Encyclopædia Britannica, Inc.

Interactives

Global average sea level change
From 1880 to 2023 the global average sea level rose by roughly 23 cm (9 inches).
Encyclopædia Britannica, Inc./Kenny Chmielewski
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