Extinction Rebellion activists have reportedly “superglued” themselves to a dual carriageway near Dover in a bid to block the port.
Two lanes at the busy Kent port have been fenced off and taken over by the environmental activists amid a heavy police presence.
Huge tailbacks can be seen on the eastbound side where traffic is queuing to reach ferries.
Outside of the town protesters are reported to have glued their hands and feet to another section of the A20 in order to halt the flow of traffic.
Activists are also allegedly attempting to block the westbound carriageway in a bid to shut down the route completely.
It is expected that the “No Food on a Dying Planet” demonstration at the Kent port will be mirrored across the Channel by fellow Extinction Rebellion activists.
The Port of Dover said it is aware of the protest and is working with police to minimise disruption.
Protesters gathered near the port throughout the morning, with songs such as The Clash’s I Fought The Law reportedly heard blaring out of a speaker set.
Live music is set to become part of the demonstration as it continues into the afternoon.
Flags and signs can be seen adorning the seafront railings, with slogans such as “rebel for life” and “climate breakdown kills”.
Chris Atkins from Extinction Rebellion Dover said: “As climate change develops, millions of ordinary Britons will face the real and growing threat of food shortages, hunger and starvation.
“Extreme storms and floods are already causing major crop failures across the world, with high temperatures also hitting livestock agriculture.
“This crisis may seem far away now but given the dependency of the UK on food imports we are extremely vulnerable.
“The Government must tell the truth and act now.”
The blockade is expected to remain in place until 3pm, and a spokesperson has said that assessments carried out by the group showed that the action “will not cause any disruption to vital supplies” such as medicine.
Atkins added: “Extinction Rebellion appreciates the blockade will directly affect ordinary people and businesses, but we feel the action is necessary in order to call the government to action.”
A spokesman for the Port of Dover said: “We are aware of the protest plans and as a result, Port of Dover Police are working closely with Kent Police to ensure as minimal disruption as possible.”