A view from an aircraft shows the Teide volcano in Tenerife, near the Canary Island of La Palma, Spain September 23, 2021. REUTERS/Jon Nazca 

Flames are seen burning in the forested area of La Cumbre, near Santiago del Teide, Spanish Canary island of Tenerife, August 11, 2012. About 90 hectares (222 acres) of land had been burnt in two wildfires in Tenerife island since Friday night, according to local media. REUTERS/Santiago Ferrero (SPAIN - Tags: DISASTER ENVIRONMENT TPX IMAGES OF THE DAY) 

A forested area of La Cumbre is seen on fire, near Santiago del Teide, Spanish Canary island of Tenerife, August 11, 2012. About 90 hectares (222 acres) of land had been burnt in two wildfires in Tenerife island since Friday night, according to local media. REUTERS/Santiago Ferrero (SPAIN - Tags: DISASTER ENVIRONMENT) 

Firefighters work to put out a fire in the forest area of La Cumbre, near Santiago del Teide, Spanish Canary island of Tenerife, August 11, 2012. About 90 hectares (222 acres) of land had been burnt in two wildfires in Tenerife island since Friday night, according to local media. REUTERS/Santiago Ferrero (SPAIN - Tags: DISASTER ENVIRONMENT TPX IMAGES OF THE DAY) 

The Teide volcano is seen from its south side at sunset on Tenerife, Spain's Canary Islands, June 11, 2011. The volcano is 3,781 metres high, according to the UNESCO website for the park. It is active, but its last eruption was in 1798. Teide National Park was declared a World Heritage Site by UNESCO in 2007. Picture taken on June 11, 2011. REUTERS/Santiago Ferrero (SPAIN - Tags: ENVIRONMENT TRAVEL) 

The Llano de Ucanca, part of the Teide National Park, is seen at sunset in Tenerife, Spain's Canary Islands, June 11, 2011. The volcano is 3,781 metres high, according to the UNESCO website for the park. It is active, but its last eruption was in 1798. Teide National Park was declared a World Heritage Site by UNESCO in 2007. Picture taken on June 11, 2011. REUTERS/Santiago Ferrero (SPAIN - Tags: ENVIRONMENT TRAVEL) 

Clouds surround the Teide volcano at sunset in Tenerife, Spain's Canary Islands, June 11, 2011. The volcano is 3,781 metres high, according to the UNESCO website for the park. It is active, but its last eruption was in 1798. Teide National Park was declared a World Heritage Site by UNESCO in 2007. Picture taken on June 11, 2011. REUTERS/Santiago Ferrero (SPAIN - Tags: ENVIRONMENT TRAVEL) 

The Siete Canadas cirque is seen at Teide National Park, on the Spanish island of Tenerife June 9, 2011. Teide National Park was declared a World Heritage Site by UNESCO in 2007. REUTERS/Santiago Ferrero (SPAIN - Tags: ENVIRONMENT) 

Clouds surround the Teide volcano on Tenerife, Spain's Canary Islands June 9, 2011. The volcano is 3,781 metres high, according to the UNESCO website for the park. It is active, but its last eruption was in 1798. Teide National Park was declared a World Heritage Site by UNESCO in 2007. REUTERS/Santiago Ferrero (SPAIN - Tags: ENVIRONMENT) 

A Tajinaste Rojo (Echium widpretti) plant, which is endemic to Tenerife, is seen at Teide National Park, on the Spanish island of Tenerife June 9, 2011. Teide National Park was declared a World Heritage Site by UNESCO in 2007. REUTERS/Santiago Ferrero (SPAIN - Tags: ENVIRONMENT IMAGES OF THE DAY) 

The Teide volcano is seen behind "Descurainia bourgeauana" plants at Teide National Park in Tenerife, Spain's Canary Islands June 9, 2011. "Descurainia bourgeauana" is an endemic plant which grows only at Teide National Park. The volcano is 3,781 metres high, according to the UNESCO website for the park. Teide National Park was declared a World Heritage Site by UNESCO in 2007. REUTERS/Santiago Ferrero (SPAIN - Tags: ENVIRONMENT) 

A Tenerife's endemic plant Tajinaste Rojo (Echium widpretti) is seen at Teide National Park, on the Spain's island of Tenerife, May 29, 2009. REUTERS/Santiago Ferrero (SPAIN ENVIRONMENT) 

A Canary endemic bush called 'Retama del Teide' (Spartocytisus supranubius) is seen at Teide National Park, on the Spain's island of Tenerife, May 29, 2009. REUTERS/Santiago Ferrero (SPAIN ENVIRONMENT) 

A Canary endemic bush called 'Retama del Teide' (Spartocytisus supranubius) is seen at Teide National Park, on the Spain's island of Tenerife, May 29, 2009. REUTERS/Santiago Ferrero (SPAIN ENVIRONMENT) 

A Tenerife's endemic plant Tajinaste Rojo (Echium widpretti) is seen at Teide National Park, on the Spain's island of Tenerife, May 29, 2009. REUTERS/Santiago Ferrero (SPAIN ENVIRONMENT) 

The Teide volcano is seen behind "Descurainia bourgeauana" plants at Teide National Park in Tenerife, Spain's Canary Islands, May 23, 2008. "Descurainia bourgeauana" is an endemic plant, which grows only at Teide National Park. REUTERS/Santiago Ferrero (SPAIN) 

The Teide volcano is seen behind an "Echium wildpretti" plant at Teide National Park in Tenerife, Spain's Canary Islands, May 23, 2008. "Echium wildpretti" is an endemic plant which grows only at Teide National Park. REUTERS/Santiago Ferrero (SPAIN) 

A view of the sunset behind Teide mountain on Tenerife, as seen from Spanish Canary island of Gran Canaria, August 18, 2007. Teide National Park was declared a World Heritage Site by UNESCO in last June. REUTERS/Borja Suarez (SPAIN) 

A view of the sunset behind Teide mountain on Tenerife, as seen from Spanish Canary island of Gran Canaria, August 18, 2007. Teide National Park was declared a World Heritage Site by UNESCO in last June. REUTERS/Borja Suarez (SPAIN) 

Clouds surround the Teide volcano on Tenerife, Spain's Canary Islands June 28, 2007. Teide National Park was declared a World Heritage Site by UNESCO on Thursday. REUTERS/Santiago Ferrero (SPAIN) 

Clouds surround the Teide volcano on Tenerife, Spain's Canary Islands June 28, 2007. Teide National Park was declared a World Heritage Site by UNESCO on Thursday. REUTERS/Santiago Ferrero (SPAIN) 

Clouds surround the Teide volcano on Tenerife, Spain's Canary Islands June 28, 2007. Teide National Park was declared a World Heritage Site by UNESCO on Thursday. REUTERS/Santiago Ferrero (SPAIN)