Hmmm... The amount of rain world wide is pretty constant. Moisture is picked up from evaporating moisture from the world's oceans (lakes, ground, etc.)--which is driven by the sun's solar radiation--which itself is pretty steady. That water condenses out of the air and falls as rain, snow, etc.
Where the rain falls tends to be variable. Based on features on the ground (water, mountains, etc.). Texas, et. al., is getting more than its "normal" share because of stalled weather fronts dumping rain there--rather than somewhere else. Much of what we see is the result of random chance and localized trends.
There are also
solar cycles (like the 11 year sun spot cycle--and other longer cycles on the order of 10's, 100's, possibly thousands of years) And even
cosmic radiation from collapsing stars and the Sun's varying magnetic field effects weather as we go through various regions in space) that also affect weather. I have noticed these cycles growing up (when first went to grade school--lots of heavy storms, even rare snow/lighting)--years later I thought that I was a little kid impressed by weather--only to experience the heavy storms again--on sunspot cycle.
What people can immediately affect is the amount of losses due to wind, rain, floods. In the US, we have been in a hurricane quiet time for several decades and have had many new structures built on the coast and flood plains of the US in the East and South--now new hurricanes are affecting millions people in areas that never had permanent settlements before (all supported by US Government Flood Insurance and Army Core of Engineers building/maintaining flood control structures)...
And that is affected by people building on the immediate coastlines, flood plans, and be helped by reducing impacts on the immediate land areas (defoliation, paving, etc. of water sheds). Also, building codes can dramatically improve survivability of natural and man-made disasters (earthquake building codes, reducing unreinforced masonry/mud brick construction, better compaction of soils used for fill, preventing flying debries--like roofs, clearing brush/trees from around homes to reduce fire risks, better built and maintained dams, etc.).
There is a lot that can be done--and much of the problem has been created by explicit government polices world wide.
-Bill