Seventeen people have been arrested as climate protesters blocked the Port of Dover in Kent.
Insulate Britain said more than 40 of its supporters targeted the cross-Channel ferry port shortly after 8am.
Their action led to vehicles attempting to cross the Channel being stuck in queues on the A40 road, with several drivers remonstrating with the activists.
One lane of the A20 remains blocked as two protesters are sat on top of a tanker.
They are reportedly glued to the vehicle.
The tanker is draped in an Insulate Britain banner and also has signs saying: “I want my children to survive”, and: “Arrested 4 times because I am in mourning for life on earth”.
“I want to be home with my family spending time with them, but if we don’t do this they aren’t going to have a future.
“The Government are not doing enough. On the current trajectory we are heading for chaos.”
The other protester, 28-year-old Josh, said: “We are here today to get the Government to insulate the houses of the UK.
“The reason being is because per-pound invested insulation is the fastest and cheapest way to reduce CO2.”
They also held a demonstration outside the Home Office’s Westminster headquarters.
A spokesperson for the group said the speed and scale of action required to cut climate emissions “requires economic disruption” and a “Churchillian response”.
Kent Police said it was alerted to the protests at 8.20am on Friday. Seventeen arrests have been made.
The force added: “Kent Police is aware of the traffic disruption in the area and is working with partner agencies to minimise delays.”
“The demonstrations we have seen over the last few weeks have wreaked havoc on our roads, disrupted thousands of people and put lives in danger and we are taking action to prevent these kinds of guerrilla tactics being used in the future.
“We thank the police for their quick and decisive action to remove the protesters and keep the port open.”
The Port of Dover is Europe’s busiest ferry port and handles 17% of the UK’s trade in goods.
It was used by an average of 6,200 road haulage vehicles every day last year.
The blockage comes amid disruption to supplies across the UK due to a shortage of lorry drivers.