Hi Garlic -
In the language of climate change finance, "mitigation" is the label given to investment to reduce emission growth (through renewables, energy efficiency, tropical forest conservation etc..), investment to prepare countries and industries for higher temperatures, rising sea levels and more extreme weather events is called "adaptation", and there is now also talk of money needed to deal with "loss and damage".
Overall best estimates are that around 98 billion dollars worldwide went into mitigation and adaptation in 2011 (or around 1/6 of the US millitary budget) - and you are right more money went into mitigation than adaptation.
Both money for mitigation and adaptation are needed - and it is cheaper to avoid problems than to deal with them down the line.
If you want to avoid "human arrogance" I would avoid fondly thinking that humans will be able to smoothly adapt to climate change unprecedented in our history by building floating cities and food production systems. More likely are huge numbers of climate refugees, resource wars and extinctions.
There are big business interests on all sides - it is not like power and water are cottage industries!. There is much more investment tied up in extracting and burning fossil fuels than in finding low-carbon solutions.
As for your last question about why we can't have better food distribution systems - it's a good question - but you seem to be confusing efficiency and equity (fairness). Yes we can confidently transport oil, gas, electricity and food long distances, but still many people have no electricity, not enough food etc....