International Energy Agency (IEA) warns that greenhouse gases will not peak before 2040 under countries' stated intentions, targets and existing measures.
The declaration has been signed by scientists from the University of Sydney, Australia, Oregon State University and Tufts University in the US and the University of Cape Town in South Africa.
Caroline Lucas MP, Guardian columnist George Monbiot (pictured) and Extinction Rebellion are seeking to overturn the protest banning order imposed by the Met.