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When picking the Problem to work on, I suggest using a metric based on the ratio of potential impact to the number of people now working on it. (i.e. big potential with many people is not good, smaller potential on a neglected issue is better if you want to have personal impact)
For instance, if you will graduate soon, recognize that many, many people are working on solar panels. No matter how good you are, it is unlikely that you'll find something dramatic. On the other hand, virtually nobody works on heat pumps. So, pick heat pumps and have big impact.
Even less than heat pumps, @bobwyman, is the routine cleaning/servicing of #HVACR #cooling equipment, particularly commercial #refrigeration -- such things as coil cleaning, filter replacement, etc.pic.twitter.com/g5XT2xzpV7
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