Mirror: The deadline for going green and and saving the planet from dangerous warming was dramatically spelled out at the Copenhagen climate conference yesterday. If we are not making drastic cuts in pollution by 2020, costing everybody on the planet up to £150-a-year, we have virtually no chance of limiting temperature rises to 2C. Only geo-engineering solutions such as covering the planet in artificial trees or reflecting sunlight back into space with mirrors could save us. They are …