@PensiveTM Biofuels: Net primary productivity, the photosynthetic ceiling, and HANNP --- human appropriation of net primary productivity.

The pre-petroleum world was based on biofuels, and ... we were chafing at the limits by the early 1900s. Keep in mind that coal didn't surpass wood use in the United States until the 1880s. (Petroleum surpassed coal in the 1950s.)

Global human appropriation of net primary production (HANPP)
https://editors.eol.org/eoearth/wiki/Global_human_appropriation_of_net_primary_production_(HANPP)

The Photosynthetic Ceiling
https://agroinnovations.com/blog/2007/04/27/the-photosynthetic-ceiling/

Photosynthetic ceilings
https://web.archive.org/web/20120810132407/https://environmental-issues.wikispaces.com/Photosynthetic+ceilings

@breadandcircuses

#NetPrimaryProductivity #PhotosyntheticCeiling #HANNP #Biofuels #limits #LimitsToGrowth