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Intense Mediterranean Sea heatwave raises fears for marine life - July 2025

Warmer water at the seaside might sound nice for your holiday dip, but recent ocean heat in the Mediterranean Sea has been so intense that scientists fear potentially devastating consequences for marine life.

The temperature of the sea surface regularly passed 30C off the coast of Majorca and elsewhere in late June and early July, in places six or seven degrees above usual.

That's probably warmer than your local leisure centre swimming pool.

It has been the western Med's most extreme marine heatwave ever recorded for the time of year, affecting large areas of the sea for weeks on end.

The heat appears to be cooling off, but some species simply struggle to cope with such prolonged and intense warmth, with potential knock-on effects for fish stocks.

To give you some idea of these temperatures, most leisure centre swimming pools are heated to roughly 28C. Competitive swimming pools are slightly cooler at 25-28C, World Aquatics says.

Children's pools are a bit warmer, recommended at 29-31C or 30-32C for babies, according to the Swimming Teachers' Association.

Such balmy temperatures might sound attractive, but they can pose hidden threats. Harmful bacteria and algae can often spread more easily in warmer seawater, which isn't treated with cleaning chemicals like your local pool.

30 % + of Species could go Extinct with 4° of Warming

How many species could go extinct from climate change? It depends on how hot it gets.

 

Two Kea birds, Arthurs Pass South Island New Zealand. The species is listed as threatened in that country and climate change is among the reasons their numbers are in danger.

Two Kea birds, Arthurs Pass South Island New Zealand. The species is listed as threatened in that country and climate change is among the reasons their numbers are in danger.

 

To consider how climate change could cause some extinctions, imagine a tiny mountain bird that eats the berries of a particular mountain tree.

That tree can only grow at a specific elevation around the mountain, where it's evolved over millennia to thrive in that microclimate. As global temperatures rise, both the tree and the bird will be forced to rise too, tracking their microclimate as it moves uphill. But they can only go so far.

Climate change: Satellite maps warming impact on global glaciers - 2023

Baltoro

Glaciers are not easy targets for any type of satellite to measure mass loss over time


Scientists have obtained their best satellite assessment yet of the status of the world's glaciers.

Europe's Cryosat satellite tracked the 200,000 or so glaciers on Earth and found they have lost 2,720bn tonnes of ice in 10 years due to climate change.

That's equivalent to losing 2% of their bulk in a decade.

Monitoring how quickly glaciers are changing is important because millions of people rely on them for water and farming.

Climate change: recent, rapid ocean warming alarms scientists - 2023

sun over the oceabn

A recent, rapid heating of the world's oceans has alarmed scientists concerned that it will add to global warming.

This month, the global sea surface hit a new record high temperature. It has never warmed this much, this quickly.

Scientists don't fully understand why this has happened.

But they worry that, combined with other weather events, the world's temperature could reach a concerning new level by the end of next year.

Experts believe that a strong El Niño weather event - a weather system that heats the ocean - will also set in over the next months.

What is biodiversity and how are we protecting it?

 

Baby Amur leopard also known as the Manchurian leopard, at the Parc des felins, in Nesles, south-eastern Paris.

Amur leopards are one of the most endangered species in the world


Targets to reverse the decline of biodiversity by 2030 may be missed without urgent action, according to a new report.

This goal was a key part of the UN global summit on biodiversity held in December 2022.

Nearly a third of all monitored species are currently endangered due to human activities.

2023 - Accelerating melt of ice sheets now unmistakable.

Greenland Ice Sheet

Warmer air is melting the top of the Greenland Ice Sheet

If you could shape an ice cube out of all the ice losses from Greenland and Antarctica over the past three decades, it would stand 20km high.

An international group of scientists who work with satellite data say the acceleration in the melting of Earth's ice sheets is now unmistakable.

They calculate the planet's frozen poles lost 7,560 billion tonnes in mass between 1992 and 2022.

Seven of the worst melting years have occurred in the past decade.

Mass loss from Greenland and Antarctica is now responsible for a quarter of all sea-level rise.

This contribution is five times what it was 30 years ago.

The latest assessment comes from the Ice Sheet Mass Balance Intercomparison Exercise, or Imbie.

UN climate report: Scientists release 'survival guide' to avert climate disaster - 2023

UN climate report: Scientists release 'survival guide' to avert climate disaster

Scientists from the Intergovernmental Panel on Climate Change met in Switzerland where glaciers are melting

Scientists from the Intergovernmental Panel on Climate Change met in Switzerland where glaciers are melting


UN chief Antonio Guterres says a major new report on climate change is a "survival guide for humanity".

Clean energy and technology can be exploited to avoid the growing climate disaster, the report says.

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