Hamburg takes steps to impose Germany's first big city ban on old diesels
Environmentalists say the measures in Hamburg do not go far enough because they target only selected streets where air monitoring stations are in place
With world's worst air, Indian city struggles to track pollution
"Every week a lung cancer patient walks in; earlier we would get one in three months."
London looking into more car-free days to cut pollution
Cities and nations around the world are planning to restrict or ban the use of diesel and petrol vehicles in the years ahead
Arctic oil "undrillable" amid global warming - UN's ex-climate chief
The past three years have been the hottest since records began in the 19th century
Electrified roads: Swedish project could slash cost of electric vehicles
An electrified road in Sweden that charges vehicles as they drive along could potentially help cut the high cost of electric cars
Warnings of more lava and possible explosion at Hawaiian volcano
Since Hawaii's Kilauea volcano began erupting on May 3, nearly 2,000 people have been ordered to evacuate as 18 giant fissures ripped through the area
Unusually severe Indian weather kills at least 66; more storms on the way
Storms are common at this time of the year but the severity of the weather this year, and the human cost, have been unusual
Burst dam at Kenyan rose farm lacked permits, police investigate
Villagers had complained when the dams were built, accusing the farm-owner of depriving them of access to river water
Plastics mines? Europe struggles as pollution piles up
Recycling closer to home is held back by the fact that the plastic is often dirty and unsorted
Kenyan rose-farm dam bursts, "sea of water" kills 47
After a severe drought last year, East Africa has been hit by two months of heavy rain, affecting nearly a million people in Kenya, Somalia, Ethiopia and Uganda