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Chapter 18: Problem 7

What evidence do global land and ocean temperatures provide for a warming Earth?

Short Answer

Expert verified
Global land and ocean temperatures provide evidence for a warming Earth by showing a consistently increasing trend over a long period, an escalation in ocean heat content, and accelerated melting of ice on land and sea. All these factors point to a global climate change indicative of a warming Earth.

Step by step solution

01

Understand the Earth's Temperature Pattern

Global land and ocean temperature trends provide valuable evidence for global warming. When these temperatures show a consistent increase over a long period, it is a strong indication of a warming planet. Scientists analyze historical temperature data to identify these trends. This could include direct observations and indirect data from tree rings, ice cores, and other sources.
02

Note the Increasing Trend

According to the National Aeronautics and Space Administration (NASA), the global temperature has increased by about 1.4 degrees Fahrenheit since 1880. This average temperature rise may not sound substantial, but it signifies a significant shift in the Earth's climatic balance. This is a major piece of evidence reflecting Earth's warming.
03

Consider the Ocean Heat Content

In addition to land temperature measurement, the ocean heat content also provides evidence for a warming Earth. The oceans absorb about 90% of the excess heat trapped by greenhouse gases. Thus, an increase in ocean heat content also indicates global warming.
04

Consider the Global Ice Melting

Global warming is causing glaciers and polar ice caps to melt faster than predicted. This phenomenon is leading to rising sea levels, which is a direct result of increasing global land and ocean temperatures.

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