Volcanoes, earthquakes, and tsunamis and other natural disasters are difficult to detect in advance and to stop. There is one scary natural disaster we can do something about. Meteors have been hitting the earth since is first coalesced, and in a positive way have helped evolution. Now we are 7 billion people and have a shorter attention span, but have the ability to prevent the mass loss of Life.
First thing we need to do is detect the meteors as early as possible to give us a long lead time to deflect them. The recent small Russian meteor was missed by the current NASA tracking system, as it cannot see meteors coming from the sun.
The private, non-profit, B612 foundation has been working on a better infrared detector, that will orbit the sun closer in than Earth so it is never blinded by the sun. Scheduled to be launched next year. A private venture that benefits mankind.