Policy

Applying levies by volume rather than calorific content makes greener fuels comparatively more expensive than petrol or diesel

Transport secretary to announce increase in speed limit from 70mph to 80mph at Tory conference

Prime minister brands five per cent increase in plastic bag use unacceptable

Campaign for new international law gains momentum as lawyers prepare to stage mock ecocide trial

Sarkozy returns to reject carbon tax plans with proposal for new levy on polluting firms

Rule allowing extended solar farms to receive higher level of incentives despite August cuts will be revoked next month

More details on demanding US fuel efficiency standards not now expected until mid-November

Two new policy proposals could deliver the stability low carbon investors need

Labour's green agenda is slowly taking shape, but without more detail it risks fuelling investor uncertainty

Ministers call this the 'greenest government ever' - never has a claim been so much hot air