Shell will be absent when the COP26 climate talks begin in Glasgow, after being told it would not be welcome, the company's chief executive admitted.
"We are not represented," Ben van Beurden told journalists during a call to discuss the company's third-quarter results on Thursday.
"We were told that we were not welcome, so we will not be there. That's probably all there is to it."
Van Beurden said he is aiming to publish an article on LinkedIn, possibly on Friday, to outline his hopes for the summit.
"I do hope that, indeed, people who are representing the nations of the world are going to make the right choices. I will put my hopes on paper and you can see what I think about it," he said.
Representatives from nearly 200 countries will meet in the Scottish city from 31 October to 12 November for talks to strengthen action to tackle global warming under the 2015 Paris Agreement.
A report last week in the Guardian newspaper revealed that oil and gas companies have been given "no official role" at the summit.
The report cited private emails from British civil servants expressing doubt over some oil companies' energy transition plans.