The Green Alliance say they are:

A charity and independent think tank focused on ambitious leadership for the environment.

Since 1979, we have been working with a growing network of influential leaders in business, NGOs and politics to stimulate new thinking and dialogue on environmental policy, and increase political action and support for environmental solutions in the UK.

They announced on Valentine's Day 2015 that:

More on Dave, Nick and Ed Pledge to Save the Planet

Earlier this month Professor Kevin Anderson, Chair in Energy and Climate Change at the University of Manchester, gave a presentation at the Cabot Institute at the University of  Bristol. He expressed his basic thesis as follows:

More on The Climate Change Emperor Has No Clothes