Revelation 8:7“The first angel sounded, and there followed hail and fire mingled with blood, and they were cast upon the earth: and the third part of trees was …burnt up, and all green grass was burnt up.”
Now it begins. This is still considered to be in the first 3 and 1/2 years, the first 21 months was the antichrist taking over and using the power given him by satan to cause the wars and begin martyring the believers that have been saved since the rapture. This second 21 months is God beginning to unleash His wrath on the earth and unbelievers. This helps to convert some but most will stay true to the antichrist. The first angel released hail mingled with blood which burned up a third of all vegetation except the grass and all of it was burnt up. Some religions will teach that God does not punish, but this is the beginning of God’s punishment for man not believing in Him.