The terms global warming and climate change are used by many, seemingly interchangeably. But do they really mean the same thing?

Scientists shaped the history of the terms while attempting to accurately describe how humans continue to alter the planet. Later, political strategists adopted the terms to influence public opinion.

Atmospheric scientists originally used the phrase “inadvertent climate modification” when they were unsure if industrial activity would lead to warming or cooling of the planet, according to NASA.

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In 1975, geochemist Wallace Broecker introduced the term “climate change” in an article published by Science. In 1979, a National Academy of Sciences report used the term “global warming” to define increases in the Earth’s average surface temperature, while “climate change” more broadly referred to the numerous effects of this increase, such as sea-level rise and ocean acidification.

During the following decades, some industrialists and politicians launched a campaign to sow doubt in the minds of the American public about the ability of fossil-fuel use, deforestation and other human activities to influence the planet’s climate, according to the Oxford Handbook of Climate Change and Society.

Word use played a critical role in developing that doubt. For example, the conservative wordsmith and pollster, Frank Luntz wrote a memo encouraging the use of “climate change” because the phrase sounded less scary than “global warming,” reported the Guardian.

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However, Luntz’s recommendation wasn’t necessary. A Google Ngram Viewer chart shows that by 1993 climate change was already more commonly used in books than global warming. By the end of the next decade both words were used more frequently, and climate change was used nearly twice as often as global warming.

The popularity of the phrase climate change represents a rare instance where scientists and spin doctors agreed. NASA used the term because it more accurately reflects the wide range of changes to the planet caused by increasing amounts of greenhouse gases in the atmosphere.

The debate isn’t new. A century ago, chemist Svante Arrhenius started one of the first debates over the potential for humans to influence the planet’s climate. Arrhenius calculated the ability of carbon dioxide to trap heat in the Earth’s atmosphere, but other chemists disagreed. Some argued that humans weren’t producing enough greenhouse gases, while others claimed the effects would be tiny. Now, of course, we know that whatever you call it, human behavior is warming the planet, with stark consequences ahead.

Photo: Corbis