“we will be facing Katrinas all over the world”
While there is wide consensus that warming is occurring as you correctly detailed above, no one storm or event can be attributed to this warming.
“The question is what to do about it.”
Some of the proposed solutions which crush personal autonomy and / or threaten Global Economic Depression scare me more than warming itself. We already know what a 10 year long Depression leads to. Dictators and would be dictators love such crises as Global Warming as excuses to more tightly control our lives.
However, there are many common sense actions that can be taken which do not threaten personal autonomy or economic downturn. They will also make the USA less dependent upon the oil that some of the above mentioned dictators control. Yesterday we traded in the gas guzzler.