The capsules swallowed by the 50 subjects measured 26 x 13 mm.

"Greenland currently contributes 25% to global sea level rise, or 0.6 mm per year. If the current melting continues, this contribution could reach up to 1 metre by 2100," adds Xavier Fettweis, climatologist at ULiège.

Crusius bought a semiautomatic rifle online and 1,000 rounds of hollow-point 7.62 x 39 mm ammunition.

The Category 1 storm dumped 2,777 mm of rain over the south of the island, unleashing flash floods and landslides that killed nearly 900 people.

“Much of the warning area is likely to see 20mm to 30mm fall over nine to 12 hours, though some places may see 50mm to 80 mm,” a spokesman said.