The chicken liver sponge has sailed through a test of its ability to filter pollutants in a harbour in Spain’s Costa Brava

In the polluted waters of Marina Palamós on Spain’s Costa Brava, Manuel Maldonado, a sponge biologist, noticed something unusual last month: red starfish had started settling in the area.

Nearly two years earlier, the Spanish National Research Council scientist and his colleagues had begun transplanting sea sponges into the port to study whether they could survive in its polluted waters.

City council emphasises economic case for Madring amid local outrage over disruption and environmental impact

Opponents of Madrid’s newly constructed Formula One circuit have accused the regional authorities of putting profit before people’s wellbeing after tests for the inaugural Spanish Grand Prix at the track later this month yielded noise levels that were many times the legal decibel limit.

The regional government of Madrid and the city council are hoping that the 5.4km-long (3.3 miles) Madring circuit – which has been built in the north-east of the Spanish capital at a cost of €83m (£71m) – will attract visitors, boost the local economy and put the city firmly on the motor racing map. The Madring bills itself as “a perfectly connected circuit: just 20 minutes from the city centre”.

City council emphasises economic case for Madring amid local outrage over disruption and environmental impact

Opponents of Madrid’s newly constructed Formula One circuit have accused the regional authorities of putting profit before people’s wellbeing after tests for the inaugural Spanish Grand Prix at the track later this month yielded noise levels that were many times the legal decibel limit.

The regional government of Madrid and the city council are hoping that the 5.4km-long (3.3 miles) Madring circuit – which has been built in the north-east of the Spanish capital at a cost of €83m (£71m) – will attract visitors, boost the local economy and put the city firmly on the motor racing map. The Madring bills itself as “a perfectly connected circuit: just 20 minutes from the city centre”.