Mirza Ghulam Ahmad prophesied and gave a timely warning. If the world does not turn to G-d it would see the signs of devastation:
A sign will appear some days from now, which shall devastate country and town and meadow. So suddenly will people be seized by divine wrath, an undressed person will have no time to secure his loincloth.They shall all be suddenly shaken by the earthquake; be it men, or trees, or rocks, or oceans.In the twinkling of an eye the earth will be thrown upside down, blood will flow like in streams. Those whose night garments were white as Jasmine, will wake up in the morning clad in red. Men and animals will lose their senses, and pigeons and nightingales will forget their songs. That hour will be hard upon every traveler and every wayfarer will lose his way in agony. With the blood of the dead, Mountain streams will become red as red wine .Men high and low will be convulsed with fear; Even the Czar, at that hour, will be in a wretched state. This sign will be an example of divine wrath, and heaven will attack with a drawn sword...I cannot say with certainty if it will in fact be an earthquake. It may not be an earthquake but some other dire calamity evoking the spectacle of doomsday, the like of which would not have been witnessed by this age, and which would bring about great destruction of life and property. However, if no such extraordinary sign appears and people do not openly reform themselves, then I shall prove to be a liar.
- Hazrat Mirza Ghulam Ahmad,
Barahin-e-Ahamdiyya
Ahmad, writing in 1905, foretold an international catastrophe which would affect both humankind and the environment. He foretold it would be like an earthquake but not an earthquake - 'It may not be an earthquake but some other dire calamity evoking the spectacle of doomsday'. Notably, the Quran has compared war to an earthquake:
O ye who believe! remember the favour of Allah on you when there came down upon you hosts, and We sent against them a wind and hosts that you saw not. And Allah sees what you do. When they came upon you from above you, and from below you, and when your eyes became distracted, and your hearts reached to the throats, and you thought diverse thoughts about Allah. There
and then were the believers
sorely tried, and they were shaken with a violent shaking.
- Quran 33:10-12
Ahmad's prophecy goes on to foretell bloodshed, death, the end of the Czar (Russia's king at the time), drawn swords (ie violence) and destruction of property, exactly fitting the signs which all occurred nine years later during the First World War. The prophecy also adds the events occurring would be 'the like of which would not have been witnessed by this age' and certainly through human history there had previously been no disaster on the scale of this war.
http://www.wikiahmadiyya.org/history/hazrat-mirza-ghulam-ahmad/prophecies-by-mirza-ghulam-ahmad