sceptic

But sceptics are questioning the accuracy of that claim - and the motive behind it.

Sir Keir spoke directly after Prince William, challenging climate sceptics with a promise to double-down on net zero, while acknowledging the "consensus is gone" among international partners on the issue of climate change.

To win over the staunchest sceptics, Tuesday's talks will cover a range of "flexibilities" for member states, including letting countries count carbon credits purchased to finance projects outside Europe.

Some sceptics are now publicly asking whether the rapid rise in the value of AI tech companies may be, at least in part, the result of what they call "financial engineering".

Mr Altman's announcement on Tuesday comes as sceptics have been questioning the rapid rise in the value of AI tech companies.