At an event at Tate Modern, Sadiq Khan pledged to clean up London's act.
A new threat looms over northern Scotland as Scottish & Southern Electricity seeks to erect a further 47 wind turbines at Strathy South. This will directly imperil golden eagles, hen harriers and the rare wood sandpiper – estimated to number no more than a few breeding pairs in all of Britain.
The trend over the last few years has been for public transport authorities to accept that their data should be made public - while at the same time letting the private sector absorb the cost of making use of it.
China's rapid industrialisation has not been accompanied by a respect for the natural environment - but, as pollution problems become so severe that they can no longer be ignored, engineers are beginning to dream up ambitious solutions to problems created by ambitious modernity.
The tiny pieces of plastic that we throw away every year are forming a new layer of sedentary rock across the planet - just another sign of our careless attitude to waste.
People need to be able to feel they can effect change in their own backyard before they can change the world.
The party should face a far more rigorous examination of its unscientific beliefs.
Many people use them interchangeably, but they mean subtly different things - yet when it comes to influencing public opinion, scientists should perhaps use the less-accurate one.
The nuclear weapons system is a red-line issue for the nationalist grassroots.
Countries like Germany, China and Japan are racing ahead in switching to renewable energy sources, while the UK continues to stubbornly stick to outdated nuclear power.
John Oliver, once of The Daily Show, and America's “Science Guy” Bill Nye show the world how to debate with climate-change deniers.
The Zombie PM