A ban on selling new petrol, diesel or hybrid cars in the UK will be brought forward from 2040 to 2035 at the latest, under government plans.
The change comes after experts said 2040 would be too late if the UK wants to achieve its target of emitting virtually zero carbon by 2050.
Boris Johnson unveiled the policy as part of a launch event for a United Nations climate summit in November.
He said 2020 would be a "defining year of climate action" for the planet.
The summit, known as COP26, is being hosted in Glasgow. It is an annual UN-led gathering set up to assess progress on tackling climate change.
Hybrid vehicles are also now being included in the proposals, which were originally announced in July 2017.
People will only be able to buy electric or hydrogen cars and vans, once the ban comes into effect.
The change in plans, which will be subject to a consultation, comes after experts warned the previous target date of 2040 would still leave old conventional cars on the roads following the clean-up date of 2050.
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