International Energy Agency (IEA) warns that greenhouse gases will not peak before 2040 under countries' stated intentions, targets and existing measures.
Local governments in the US can play a huge role in sustainability. They can help the environment on a small-scale level as well as encourage sustainability among its citizens.
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.