U.S. climate summit aims for a new carbon goal: zero
"There's something great about ... the power of zero in focusing minds. It's a concept everybody gets"
Film on rape victims' recovery shows unseen side of Congo war
Rape has been widely documented as a weapon of war in eastern Congo
No women, no progress, development experts warn
Inequality in development presents a "grave challenge to progress" and could fuel extremism
Lack of awareness holds back British businesses that do good - industry
Unlike the Fairtrade scheme - which guarantees producers in developing countries a fair price - few people know how social enterprises work
Netherlands switches gears with world's first used-plastic bike path
Eight million tonnes of plastic – bottles, packaging and other waste – are dumped into the ocean every year
Inclusive or invasive? Digital ID stirs debate
More than 1 billion people globally have no way of proving their identity
Arid Niger a 'model for Africa' as desert blooms
Rainwater storage and smarter farming is making life easier for Niger's farmers
Wet weather brings rise in tick-related cattle deaths in Zimbabwe
Changing weather patterns linked to climate change are bringing new pest worries
In war on smog, China considers how to take polluting diesel trucks off the road
The policy would come into effect in 2020 and would be implemented in the smoggiest northern regions of the country