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This data image shows the monthly average sea surface temperature for May 2015. Between 2013 and 2016, a large mass of unusually warm ocean water--nicknamed the blob--dominated the North Pacific, indicated here by red, pink, and yellow colors signifying temperatures as much as three degrees Celsius (five degrees Fahrenheit) higher than average. Data are from the NASA Multi-scale Ultra-high Resolution Sea Surface Temperature (MUR SST) Analysis product.

Environment

Extreme marine heatwaves are now normal for the world's oceans

Since 2014, more than half of the ocean surface across the globe has recorded temperatures considered extreme compared with a historical average

News

Float carrying sensors

Technology

Outsider wins DARPA challenge to predict where floats drift at sea

News

Ambergris: What fragrant whale excretions tell us about ancient oceans

Humans

Ambergris: What fragrant whale excretions tell us about ancient oceans

Features

A man swimming next to a floating, solar-powered sensor

Technology

US military offers $50,000 to predict where sensors drift in the ocean

News

Satellite view of Australian wildfires

Environment

Most CO2 from Australia’s megafires has been offset by algal blooms

News

A grenadier fish swimming along the sea floor near an anemone

Life

A glimpse at Greenland's deep-sea ecosystems threatened by fishing

News

Giant coral is the widest ever found in the Great Barrier Reef

Life

Giant coral is the widest ever found in the Great Barrier Reef

News

We have just two years to stop deep-sea mining from going ahead

Environment

We have just two years to stop deep-sea mining from going ahead

Comment

Controversial geoengineering scheme will dump iron in the sea

Environment

Controversial geoengineering scheme will dump iron in the sea

News

How your seaweed-filled beach pics could help monitor climate change

Environment

How your seaweed-filled beach pics could help monitor climate change

Seaweed can reveal a lot about marine ecosystems. Take part in the Big Seaweed Search to help researchers discover how climate change is impacting UK sea life

Regulars

Technology

Stealthy marine robot begins studying mysterious deep-water life

News

Environment

The world has missed its target for protecting oceans to save species

News

Humans

Rubber slabs washed up in Brazil traced to second world war shipwreck

News

Question

How many hearts does an octopus have?