When Adam sinned the ground brought forth thorns and thistles. When Cain killed his brother the earth no longer yielded its strength. The sins of men affect the earth.
Isa 24:5-6 The earth also is defiled under the inhabitants thereof; because they have transgressed the laws, changed the ordinance, broken the everlasting covenant. (6) Therefore hath the curse devoured the earth, and they that dwell therein are desolate: therefore the inhabitants of the earth are burned, and few men left.
Natural disasters are not caused by God, they are caused by the sinfulness of mankind. The laws of nature designed by God to bless are turned into weapons of destruction through man's sinfulness. As man sows evil into the earth so he reaps a whirlwind