What is Earth Day and what has it achieved? The worldwide event aims to raise awareness about the need to protect the environment.
Could an almighty eruption destroy a dreamy Greek island? Scientists are investigating for the first time how dangerous the island's next big one could be.
Could AI text alerts help save snow leopards from extinction? In Pakistan, it's hoped newly-developed AI cameras could warn villagers via text to move their livestock if snow leopards enter the area.
Oldest serving US astronaut returns to Earth on 70th birthday A capsule with Dan Pettit and his two Russian crewmates lands in Kazakhstan after a space station mission.
Project to suck carbon out of sea begins in UK A pilot project will test whether it is a useful way of fighting climate change.
Australia opposition leader clarifies he believes in climate change after debate Peter Dutton is facing outrage after comments he made on climate change during an election debate.
The truth about life on other planets - and what it means for humans Could discoveries of alien life ever change the human psyche in how we view ourselves and each other?
Telescope finds promising hints of life on distant planet Scientists find new but tentative evidence that a faraway world orbiting another star may be home to life.
Colossal squid filmed in ocean for the first time Stunned scientists say the extremely rare squid can weigh up to 500kg (1,100lb).
England water pollution at 10-year high, campaigners say Campaigners release official data showing the most serious pollution incidents in England are double the target.
Watch: New speed climbing record set in the Swiss Alps A climbing pair shatter the record for completing the daunting north faces of a famed trio of Swiss mountains.
