A team of more than a dozen scientists collected and analyzed an Alpine ice core to reconstruct the environmental conditions of Europe during the World War I. Deaths in Europe peaked three times during World War I and all the spikes occurred during or soon after heavy rain and cold weather, according to the study. Photos: World War I: A time of upheaval Photos: World War I: A time of upheaval French soldiers sing the national anthem at the beginning of World War I in August 1914. With more than 30 combatant nations and nearly 70 million men mobilized, World War I profoundly destabilized the international order. Hide Caption 2 of 25 Photos: World War I: A time of upheaval Germans in Berlin mobilize for war on August 1, 1914.

Source: CNN September 28, 2020 10:12 UTC