There are boggling challenges on the planet, each of them affecting all of us, one way or another. Food. Clean water. Vaccinations. Health care in general. Then those second-level concerns which are also catalysts for the big problems: transportation, communications, finance.
There are about 7.2 billion people on the Earth-around a modest 7 gigapeople in computer terms. (This should give one an idea of how big all those magnitudes beyond a gigabyte-terabytes, petabytes, exabytes, and zettabytes–really are.)
Trillions of dollars will be required to solve any of the big problems for all the people of the world. I would like to think that millions of dedicated people devising vast IoT solutions will make steady progress in each area over the coming years and decades.