A new UK trial hopes to reduce the condensation trails from planes, which can trap heat in the Earth’s atmosphere.
OpenAI insisted this was not in response to a particular issue with children believing ChatGPT to be alive.
Meta argued social media addiction does not exist, as a trial stemming from a major lawsuit brought by US states started.
The war in Ukraine has spurred people to consider putting vital infrastructure underground.
The ChatGPT-maker said training will be slowed for two weeks while it puts the upgrades in place.
According to a Freedom of Information (FOI) request the number of letters sent has almost tripled since 2024.
Richard Haldenby says his average monthly bill for Harvest had risen from $130 (£95.50) to $2,110.
The app lets users create six-second looping videos and hosts more than two million classic videos.