By Ian Youngs
Entertainment & arts reporter
By Justin Rowlatt
Chief environment correspondent
How did a cyber attack lead to a shortage of petrol in the US?
Ella Adoo-Kissi-Debrah's mother says "all children have the right to breathe clean air".
By Emma Simpson
Business correspondent, BBC News
By Justin Rowlatt & Laurence Knight
Fishermen on Lake Victoria in Kenya have begun using some of Africa’s first electric fishing boats.
The UK was one of the first countries in Europe to ban lead in petrol. A campaign successfully proved it was poisoning children and leaving them permanently brain damaged.
By Simon Jack
By Howard Mustoe
BBC Radio Cornwall
Cornwall Council is launching a new green plan to replace its whole fleet of 1,000 vehicles with ones powered by a renewable fuel source.
A trial is involving six diary farms and a Cornish technology company making a new fuel from slurry - biomethane.
If the scheme is successful, it could be rolled out to hundreds of small-scale farms across Cornwall, staff said.
Al Hoare, who manages the fleet of council arms-length contractor company Cormac, said it replaced its vehicles every five years, so it would take some time to be carbon-neutral.
But he added: "As more of these vehicles are produced, unit costs will come down, ultimately saving tax payers' money, as well as the obvious benefit in reduced carbon emissions and the positive effect that has on the environment."Copyright: BBC