Scientists believe worlds with low carbon dioxide levels could be inhabited
This could mean the planets have oceans and an ozone layer
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Scientists have identified a new clue in the hunt for alien life on distant planets.
A team from the University of Birmingham and the Massachusetts Institute of Technology believe far-off worlds with low carbon dioxide levels could mean they are inhabited.
The suggestion is due to the idea that a depleted level means oceans and plants are sucking up the chemical compound.
Scientists believe NASA's James Webb Space Telescope is a prime candidate to search for low levels, as the telescope has previously uncovered atmospheric conditions of exoplanets.