A plan by a Welsh environmental centre could see the end of fossil fuel use in the UK in just 20 years.
The Centre for Alternative Technology (Cat) near Machynlleth is putting together proposals which would cut carbon emissions to zero.
At present, the UK government has pledged to reduce emissions by 80% on 1990 levels, but not until 2050.
The report's authors, Zero Carbon Britain, will publish the report in June and hope to influence policy.
The report foresees cutting energy demands in half and expanding renewable energy sources like wind, wave, solar and others.
It plans to cut emissions through the use of more energy-efficient homes and the use of electric cars.
"We are saying 100 percent by 2030," Cat researcher Alex Randall said.
"We can't keep burning fossil fuels."
The centre was established in 1974 in a disused quarry near the Powys town of Machynlleth in the southern tip of Snowdonia National Park and promotes sustainable living.