Digging deep: Singapore plans an underground future
With some 5.6 million people in an area three-fifths the size of New York City, the island nation is fast running out of space
From Markle to Michelle: 10 celebrities using star power for good in 2018
Stars from Buckingham Palace to Bollywood used their fame in 2018 to highlight global challenges from climate change to women's rights
Farming's tech revolution to have losers as well as winners
Robots could be used in fruit picking to ease labour shortages expected after Britain's exit from the European Union, researchers say
To feed the world, we must tackle the digital divide
500 million smallholder farmers need access to technology - from robotic harvesting equipment, to AI-powered advice apps
To win the race against catastrophic climate change, we need to go carbon-negative now
We can’t just slow the rate at which we add greenhouse gases to the atmosphere: we must also accelerate ways to effectively remove greenhouse gases from the atmosphere
In warming Mali, weather forecasts help cool flaring tempers
Raising a crop - or a cow - is getting harder in Africa's drought-hit Sahel, but knowing what's coming can help
Solar cures energy ills at Zimbabwe's power-short clinics
Solar power systems at health centres enable live-saving equipment to function, vaccines to be refrigerated, computers to work and patients to get better treatment - and they are good for the climate
Swedes ditch glitzy Xmas ads to guide homeless to shelter
Downtown billboards have swapped commercial ad content for directions guiding the homeless to their nearest shelter
The fight for rights: Five gains and five losses for women in 2018
Here are some gains and losses for women around the world in the past year
Brazil's incoming environment minister found guilty of improper conduct
Judge found Salles guilty of infractions including altering maps in an environmental protection plan to benefit mining companies