JohnGyakum

Ocean acidification is already a significant problem to humanity. It appears to be accelerating, particularly in nutrient-rich regions, particularly coastal regions, where, for example, the US Pacific Northwest oyster industry is vulnerable to its effects.

One of the main hazards of volcanic ashfall is when it accumulates to thicknesses where roofs can collapse. Because ash is commonly fine-grained particles (much finer than sand sometimes), the ash can absorb and hold a lot of water, making the ash much heavier than in a dry state. So if ash is falling and it is also raining, the roof collapse hazard can be very high, and people need to periodically go on top of their roofs and shovel off the ash. Of course, this action of shovelling is also hazardous, so people need to be extremely careful when doing so.

It is certainly the best known. It is partly because the houses helped preserve the people and artefacts as the houses filled up with ash and pumice. I am sure there are other examples, so I would not think this is unique.

So in terms of tipping planes, the weight of ash, especially on the wing and tail surfaces, can tip planes on the ground, especially if the ash is wet. This happened in the case of the Mt Pinatubo eruption in the Philippines in 1991.

Hurricane Patricia was the strongest hurricane in the western hemisphere in terms of its maximum wind speed at 200 miles per hour, and the lowest central pressure at 879 hPa. Patricia was one of a record-shattering nine major hurricanes during the 2015 eastern North Pacific hurricane season.