BEYOND YESTERDAY - Stephen F Montagna

After a nuclear exchange destroys over 85% of the population of the world, the survivors developed the means to go back in time and they start kidnapping people from the past to repopulate the earth as it cools down and becomes survivable again. First, they took eggs from women and sperm from males but they would not survive so they took to kidnapping souls. They took the pilots of the five aircraft that went missing in the triangle and each time they came to get more souls from the past, their entry caused a Hurricane in the Atlantic, but it was the only way to keep the human alive in the future.