Which sustainability initiative has National Geographic implemented that transformed how they produce their iconic printed maps?

Geographic Information Systems (GIS) have evolved dramatically over the past decade, with sustainability becoming a central focus in mapping technologies. Companies in the geography sector are increasingly implementing innovative sustainability initiatives to reduce their environmental impact while improving their mapping accuracy. How well do you know the cutting-edge sustainable practices being adopted by leading geography and mapping organizations?

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Switched to 100% algae-based inks that require 90% less water to produce than traditional petroleum-based inks
Created maps from recycled ocean plastic that can be reused indefinitely through a proprietary melting process
Developed carbon-negative paper by incorporating atmospheric carbon into their specialty fibers
Implemented solar-powered printing facilities that generate 150% of their energy needs, feeding excess back to local communities