&gt; Enough sunlight falls on the Earth in 5 minutes to power the world for a year.<p>At current levels, and that&#x27;s the point of the parent comment.<p>&gt; That&#x27;s effectively limitless.<p>It&#x27;s 0.0000095 or so. Impressive but not limitless. An earth in which all the infalling sunlight was used for power would be a dark place, which would be bad for people and for agriculture. And oxygen production. So actually lot less than that.