Fact Check: Did Trump post about plugging volcanoes with cement?
WASHINGTON, DC: A viral claim circulating on social media platforms shows an alleged Truth Social post attributed to President Donald Trump in which he supposedly suggests plugging volcanoes with cement to prevent eruptions. The image has triggered widespread reactions online, with users debating whether the post is real or fabricated.
The screenshot includes text paired with a crude diagram depicting a cement plug placed over the top of a volcano and inside a side chute. Many social media users have shared the image as proof of another questionable scientific suggestion by Trump. However, a closer look reveals the claim does not hold up.
Let us fact-check it.
Claim: Trump suggested blocking volcanoes with cement
A screenshot circulating online claims to show a Truth Social post in which President Trump allegedly asked why no one has tried placing cement or heavy metal rocks into active volcanoes to stop eruptions.
The text of the alleged post reads, “Why has no one ever experimented with placing cement in the mouth of volcanoes considered active, as in the image, or heavy metal rocks. And when erupting the lava would be blocked, preventing deaths and accidents.”
The post is accompanied by a mock diagram showing a volcano capped with a cement layer and an additional plug along a side channel.
Fact Check: No evidence Trump made this post
There is no record of such a post on Trump’s Truth Social account from the period referenced in viral shares.
A reverse image search shows that variations of the same graphic and text have circulated online since at least 2022, long before Trump’s current presidential term. In 2026, the image was edited to falsely appear as though Trump had shared it on Truth Social.
Based on available evidence, the image is fabricated and does not originate from Trump.
Why filling volcanoes with cement would not work
Even outside the context of the false claim, the idea of stopping volcanic eruptions by filling volcanoes with cement is not scientifically viable.
Most volcanoes already contain hardened magma and solidified rock acting as natural plugs. Pressure builds beneath these plugs until magma forces its way through cracks or new vents. Adding cement would not stop this process and could potentially increase pressure, making eruptions more explosive.
Geologists widely agree that volcanic activity cannot be controlled through simple mechanical blockages.
Trump’s past remarks on climate and science
While this specific claim is false, Trump has previously made statements questioning established climate science.
The Trump administration revoked the 2009 endangerment finding, which determined that greenhouse gas emissions pose a threat to public health. Trump has also referred to climate change as “a scam,” despite extensive scientific research showing it is a measurable and documented phenomenon.
