What does Revelation 7:16 mean?

During the tribulation, a powerful false prophet will arise in Israel (Revelation 13:11–12). He will honor the head of the Revived Roman Empire who is called "a beast" (Revelation 13:1). The false prophet will control the economic trade and will try to force everyone to worship the head of the new and controlling government. He causes everyone to receive the mark of the beast on the right hand and forehead. If a person refuses to worship the beast, he will be executed. Further, no one can buy or sell unless he has received the mark of the beast.

Obviously, tribulation believers will refuse the mark and they will not worship the beast. Consequently, many believers will be executed, and many will go hungry and thirsty. Further, many of God's judgments during the tribulation will include extreme environmental effects for all inhabitants of earth. Revelation 8:7 mentions hail and fire, mixed with blood, that burns up one third of the earth and one third of the vegetation. It will be extremely hard to survive such difficult days. Nevertheless, when these believers enter Messiah's kingdom, their hunger and thirst will end, and they will no longer experience sunburn or scorching heat.