> But you can just add more drones. 2 people planting 36k trees per day is no small feat.
According to GP:
>> Chinese mainland reforestation programme plan was 4 mln ha/year 20 years ago.
>> So, drones can plant, say pine seedlings with density of 4 thousand/ha (which is IMHO insufficient), which gives capacity of just 9 ha/day
Suppose 180 working days a year that would give: 4 * 10^6 / (180 * 9/2) ~= 5000 operators
That doesn't actually sound too bad, not sure how many drones per operator are counted for in the 36,000 trees per 2 operators with multiple drone numbers.
One a side note this could still be well above the cost of human labor in third-world countries.