How much damage can a natural disaster have an effect on the enviroment?

 the impact on the environment is crucial to the human population. the heavier (stronger) the natural disaster, the more impact is effected to the environment. For example : 1. a tornado in the plains that destroys everything in its path or 2. a huge forest fire in the rainforests or 3. a flash flood in a desert filled with non amphibian creatures that can't swim or fly. The blame for creating natural disasters (even though it is created by nature) but we are the people that are doing nothing and being careless. people say that they do help but all they do is support someone else to SUPPORT THEM!!