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BBC environment analyst
East Sussex County Council says all buildings and street lights in the county are to be powered by renewable electricity.
The decision was announced as millions around the world took to the streets as part of a climate change protest.
The council said the environmentally-friendly electricity contract will come into force in April.
Schools in the county will also be encouraged to agree their own 100% renewable energy deals.
A council spokesman said: "It means all 40,000 of the county's street lights and illuminated signs, as well as libraries and council buildings, will be powered only from electricity generated from sources such as wind, tidal and solar power."
Nick Bennett, the county council's deputy leader, said the authority had taken "huge strides" towards cutting carbon emissions, which have been halved over the last 10 years.
Farmer Adam Twine is concerned about the little-known greenhouse gas, SF6.
Former Green Party leader Steven Agnew is standing down as an MLA for North Down.
He has been appointed as head of the Northern Ireland Renewables Industry Group (NIRIG).
NIRIG is a joint collaboration between the Irish Wind Energy Association (IWEA) and RenewableUK which advises on renewable energy policy.
Mr Agnew has represented North Down since 2011 and served on Stormont's enterprise, investment and trade committee.