One eruption like this would inject so much particulate matter into the atmosphere that temperatures would fall dramatically, but it would also cause crop failures and have some negative health effects for many.

The active volcano of Krakatoa in what is now Indonesia was roughly 12 square miles in size and when it erupted in the most cataclysmic explosion in history. On 27 August 1883, the island of Krakatoa in Indonesia exploded with a force so massive, it blew itself to pieces. It’s estimated the explosions released energy a million times greater than that of a hydrogen bomb. The explosions were so powerful that they transformed Krakatoa’s highlands, which were over 1,000 feet (300 metres) high into chasms over 1,000 feet deep. One of the explosions was heard in the Philippines and Japan over 3,000 miles (5,000 km) away. Tsunami waves reached a height of 150 feet (45 metres) and reached South America.

Sailors went deaf. In western Australia, people thought they were under attack. In South Africa, the sea surged violently, rocking ships that had no idea a volcano was to blame. The sky turned black. Tsunamis as tall as a 15-story building crashed into coastlines. Entire villages vanished. One British ship captain, just 40 miles (64 km) from the blast, wrote before vanishing: “My last thoughts are with my dear wife. I am convinced the Day of Judgement has come.” But the shock didn’t stop there. Ash circled the globe, turning sunsets blood red.

It all caused the death of 36,000 people.

Apart from Krakatoa, there are other volcanos that could have major eruptions at any time, and while not necessarily nearly as big as Krakatoa, would in minutes wipe out the emissions reductions that Climate Cultists are obsessed with in NZ over a year or more.

An eruption of Mt Etna in Italy a few days ago.