Climate change

Heating and air conditioning account for half of residential consumption, which is why the single best thing we could do for the energy budget is to keep the heat

In large, populous nations, the complete reliance on these renewables would require what we are still missing: either mass-scale, long-term (days to weeks) electricity storage that would back up intermittent electricity generation, or extensive grids of high-voltage lines to transmit electricity across time zones and from sunny and windy regions to