World may come with may reasons like global warming,climate change etc. But the bible says that God is the one who sends calamity as in
Amos 3:6 If there is calamity in a city, will not the LORD have done [it?]
Amos 4:6 ,7Also I gave you cleanness of teeth in all your cities. And lack of bread in all your places; "I also withheld rain from you.
God sends all the calamities so people would repent of their sins and seek him with whole heart.
The fourth chapter of Amos (6-12) clearly reveals the calamities that God would send to a place where the people have not returned to him.
Amos 4:7,8: I also withheld rain from you, When [there were] still three months to the harvest. I made it rain on one city, I withheld rain from another city. One part was rained upon, And where it did not rain the part withered. So two [or] three cities wandered to another city to drink water, But they were not satisfied; Yet you have not returned to Me," Says the LORD.
Whenever we see a calamity in the place we live let us warn others to come out of their sins and seek God.
Let us live a holy and righteous life that is pleasing to God.