Climate change protesters have warned of hunger in the UK because hundreds of activists caused major disruptions during mass demonstrations on London bridges.
Gail Bradbrook, one of the organizers of Saturday's Extinction Rebellion, protested on five bridges in central London, claiming that if the Government does not change environmental policy, "we can easily face hunger in the UK if the effects of the weather continue like that".
"We need to build resilience in our community," he added.
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Dr. Bradbrook said: "We basically have three demands: first is that the Government must tell the truth. People think that climate change is something that happens to other people at other times, but it just came home.
"We have to go to zero pure carbon very quickly. And we also ask for a meeting of people so people can decide how that change occurs.
"We will know when the government does different things, it can feel like a war, a beautiful war. That will be great. "
Saturday's actions at Lambeth, Westminster, Waterloo, Blackfriars and Southwark bridges gave the band and speakers the opportunity to talk to the crowd, before the meeting planned at Parliament Square later.
This follows a week of protests around England under the banner of Extinction Rebellion.
On Monday, 22 people were arrested after protesters blocked traffic and stuck to the entrance to the Department of Business, Energy and Industrial Strategy.
On Wednesday, more activists were detained after the action near Downing Street and in the Department of Environment, Food and Rural Affairs at Westminster.
The committee estimates that 50 people have been arrested for protests this week.
On Saturday, activists expressed anger at the current climate policy.
Lewis, who described himself as being involved in environmental civil disobedience for more than 10 years, claims the current trend makes the world "uninhabitable".
He said: "We lived in a time when we knew that we destroyed the planet through our activities that caused harmful amounts of CO2.
"We destroy the living system where we depend and are on track to turn this planet into something that cannot be inhabited."