How well would modern society handle the dinosaur killing meteor if it happened today?

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Perhaps an applicable experiment for the post-meteor lifestyle:

Extreme Experiment Confines 15 People to Secluded Cave for 40 Days

Completely deprived of natural light, and the use of ubiquitous gadgets like phones or watches, the 15 volunteers will need to adapt to the constant 12-degree Celsius temperature and 95% humidity of the cave, generate their own electricity using a pedal boat system, and draw the water they need from 45 meters deep.