'I'd like to thank groups like the Climate Strikers and Extinction Rebellion for educating us and pushing the issue to the top of the agenda'.
A London City Airport spokesman said the captain exercised his right to arrest the passenger under global flight safety rules.
Later, answering questions about his backing for the protests, he added: 'We have to understand the passion and the motives of those that have taken part in the protests all over the country.
He was eventually removed.
The airport said it was investigating the incident concerning the BA plane to "ensure the safe and secure continuation of service".
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The group said they were protesting plans to expand the airport, which aims to have 6.5 million passengers a year by 2022 compared to the 4.8 million in 2018, and which has said there could be demand for as many as 11 million by 2035.
18,000 passengers are due to arrive or depart from the airport, with 286 flights scheduled.
"And the final irony of the climate protest on our flight".
Passengers filmed the man standing up in the middle of his aisle and reading aloud on his phone as the Aer Lingus flight to Dublin was preparing to leave.
"I'm extremely sorry to disturb everybody here".
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"We have two generations of human civilization left if we carry on doing what we're doing", the protester said, as passengers heckled him and urged staff to remove him from the flight.
It was just one of many acts of protest Thursday at the airport, where dozens of activists from the Extinction Rebellion movement had planted themselves at an entrance, according to The Guardian.
Today, members of the Czech branch of Extinction Rebellion will stand on blocks of ice with nooses around their necks at namesti Republiky.
Protesters glued themselves to the terminal building, occupied a nearby Docklands Light Railway station and blocked roads around the airport.
One man in a brown business suit climbed over coils of barbed wire and onto the roof of the east London airport's entrance before coming back down and being led away by the police.
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Earlier this week Fox News had to issue an apology after conservative commentator Michael J. Organizers with Climate Justice Edmonton (CJE) estimate 4,000 took part in Friday's events.
Witnesses reported "an extraordinary number of police officers" at the terminal as demonstrators try to emulate protesters who cancelled more than 1,000 flights as they condemned police brutality in Hong Kong. British Airways owner IAG also pledged on Thursday to meet that emissions target.