• A theory is circulating on social networks, arguing that global warming is not due to human actions, but to changes in the Earth's orbit.

  • The argument is based in particular on the fact that NASA would push this theory.

  • However, if NASA has worked well on the question of the Earth's orbit, it has never said that this was the main factor of global warming.

What if global warming had nothing to do with humans and their actions on Earth?

No need then to reduce its consumption and limit its carbon footprint.

This is the crazy theory circulating on social networks in recent weeks.

"NASA admits climate change is due to changes in Earth's orbit, not 4x4s or fossil fuels," reads a widely shared post on social media.

According to this publication, it would therefore be information advanced by NASA.

An argument that delights climate skeptics: “To say that some prefer to believe children like Greta Thunberg rather than the very rigorous Nasa.

“Another Internet user launches: “Let them stop telling us to ride bicycles, to fly less and let people do what they want then.

»

Has the famous American agency really affirmed and proven that the warming is due to the Earth's orbit?

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The Earth's orbit corresponds to the movement made by the Earth around the Sun, describing an ellipse, and whose period of revolution corresponds to one year.

It is argued that changes to this orbit are causing the warming.

As you might suspect, this is false.

Greenhouse gases are the primary culprits.

And unsurprisingly, these are produced by humans, as explained for example on the website of the European Commission.

But where does this false information come from?

The article explains that NASA relies on "Milankovitch's theory of climate, revealing that the planet is in fact changing due to external factors that have absolutely nothing to do with human activity".

This is an existing theory, and so the article likes to summarize: “The biggest factor influencing weather and climate on earth is the sun, period.

»

It's not as simple as that.

NASA has already mentioned this theory in its research, but clearly states: "If the sun were responsible for global warming, we would see a warming at the level of all layers of the atmosphere, from the surface to the uppermost one. of the atmosphere (stratosphere).

But what we actually see is a warming on the surface and a cooling in the stratosphere.

This is consistent with warming caused by a buildup of heat-trapping gases near the Earth's surface, not a hotter Sun."

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At no time does the American agency deny the human impact on global warming.

On the contrary, most scientists, and in particular the 1,300 members of the Intergovernmental Panel on Climate Change (IPCC) of the United Nations, agree that human activities are responsible.

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