Panorama of sulphur worker appearing out of toxic fumes at Kawah Ijen volcano, East Java, Indonesia, Southeast Asia, Asia

Sulphur worker appearing out of toxic fumes at Kawah Ijen, East Java, Indonesia, Southeast Asia, Asia

Toxic sulphur fumes escaping from the ceramic pipes at Kawah Ijen, Java, Indonesia, Southeast Asia, Asia

Crater lake of Kawah Ijen, Kawah Ijen, Jawa Timur, Java, Indonesia, Asia

Free-range sheep grazing, sulphur vapour, evening sky, Hveravellir geothermal area, Icelandic highlands, Suðurland, Sudurland, Iceland

Curved wooden path, sulphur vapour, Hveravellir geothermal area, evening sky, Icelandic highlands, Suðurland, Sudurland, Iceland

Woman taking picture in front of Taal Volcano crater lake and mountains, Tagaytay, Batangas, Philippines

A blue coloured boiling hot mud pool emanates steam as the sunset colours the sky orange, in Hveraröndor Hverir Geothermal Area at Namaskard Pass, North Iceland.