Reaching the 2050 climate targets are usually put in terms of increasing the share of wind and solar by such and such a percent every year until 2050. I wonder though how quickly we will use up all of the "low-hanging fruit" locations, leaving only very high maintenance cost areas or very low wind areas.<p>It might be much more difficult in future decades to get a good return on a given $1B wind investment in later years than it is now. This would considerably hamper our ability to hit the target.