I am a big fan of products and companies that make things more efficient. Like steemit which could be your social and pay you for your content at the same time. And one area that is being under-utilized is the heat that comes from mining bitcoin. It is possible to heat houses and make bitcoin mining efficient if we move to places that are cold all year around.
In order to combat global warming bitcoin mining could be displayed better in colder areas or we can start to have more products that use the heat that is created. One example is this awesome heater that mines bitcoin and keeps you warm:
https://techcrunch.com/2018/03/08/qarnot-unveils-a-cryptocurrency-heater-for-your-home/
Something to think about as bitcoin heats up (and yes that is a pun :p)