New study shows warm waters are melting Antarctica from below

The penetration of warm water to Antarctic ice shelves appears to be responsible for their dramatic decline

Sydney’s One Central Park wins world’s best tall building award

An apartment block in Chippendale impressed jurors for its sustainable design concepts, including green walls and water recycling program

The world’s best tall buildings of 2014 – in pictures

How ethical is shipping goods by sea?

Greenhouse gases from shipping are set to rise – but it’s still better than flying goods out

If you have an ethical dilemma, email Lucy at lucy.siegle@observer.co.uk

Amazon rainforest losing ability to regulate climate, scientist warns

Report says logging and burning of Amazon might be connected to worsening droughts – such as the one plaguing São Paulo

Green news roundup: nuclear waste, trees and swordfish

The week’s top environment news stories and green events

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Great Barrier Reef dredging could damage fish populations, says study

Researchers at James Cook find that larvae development is significantly stunted by murky water and increased sediment