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Where the Amazon rainforest meets the Atlantic Ocean, the Brazilian river island of Marajó is losing ground against sea-level rise as coastal erosion destroys the rich mangrove forests that act as its natural buffers.

Resembling upside-down tree roots, the tangled mangrove branches that extend into the water and provide a habitat for fish and crabs have been under increasing threat.

Same city, same heatwave - so why are poor neighbourhoods 3°C hotter?

London introduced congestion pricing over 20 years ago to tackle some of the world's worst traffic. Today, on average, drivers still spend 101 hours a year stuck in gridlock – so why is the once-controversial £15 daily charge more popular than ever?

While the charge hasn't eliminated congestion, and it's made an expensive city even more expensive, it has quietly transformed London in other ways: funnelling over £2.6 billion into public transport improvements and reducing air pollution.