God cannot cause evil things to happen. James 1:13,14 " When under trial let no one say:" I am being tried by God." For with evil things God cannot be tried, nor does he himself try anyone. But each one is tried by being drawn out and enticed by his own desire. Then the desire, when it has become fertile gives birth to sin ..."
The last part of this - the part that gives birth to sin, there is a perfect example in the once loyal angel who MADE HIMSELF Satan the Devil. As a result of his wrong desire he abandoned God's assignment and purpose for him and now 1John 5:19 gives the answer to why there are so many natural disasters and other harmful realities in our world. That scripture says in part that "the whole world is lying in the hands of the wicked one."
However, do not blame all of these disasters on Satan. Man by his greed and lack of fellow feeling has caused much of the current suffering. Ecclesiastes 8:9 tells us"
"All of this I have seen, and I applied my heart to every work that has been done under the sun, during the time that man has dominated man to his harm."