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Local farmers prize Local farmers prize Terra Terra PretaPreta
Terra PretaTerra Preta
non-Terra Pretanon-Terra Pretaadjacentadjacent
3X greater yields than adjacent soils3X greater yields than adjacent soilssustained fertility in intensive usesustained fertility in intensive usedug up and sold as potting soildug up and sold as potting soil
Small PatchesSmall Patchesaverage: 20 hectares (50 acres)average: 20 hectares (50 acres)up to 350 hectares (865 acres)up to 350 hectares (865 acres)near settlements & on bluffsnear settlements & on bluffscultural debris, animal bones, pot sherdscultural debris, animal bones, pot sherdslarge amount of charred carbonlarge amount of charred carbon
AgeAge300 to 500 years300 to 500 years800 - 4000 years800 - 4000 years6000 years6000 years, east Andes foothills, east Andes foothillsRadio-carbon dating (charcoal)Radio-carbon dating (charcoal)
Aerial SurveysAerial SurveysRecent canopy-penetrating radarRecent canopy-penetrating radar10% of total land area10% of total land areaarable land to feed 5 millionarable land to feed 5 million
BiocharBiocharAmazon Basin, BrazilAmazon Basin, Brazil
High Microbial ActivityHigh Microbial Activity““Microbial ReefMicrobial Reef””Very active Very active Soil Food WebSoil Food WebHigh diversity, high stabilityHigh diversity, high stabilityFree-living, Nitrogen-fixing bacteriaFree-living, Nitrogen-fixing bacteria
The Columbian Encounter and the Little Ice Age:The Columbian Encounter and the Little Ice Age: Abrupt Land Use Change, Fire, and Greenhouse ForcingAbrupt Land Use Change, Fire, and Greenhouse Forcing
Annals of the Association of American GeographersAnnals of the Association of American Geographers Vol. 100 # 4Vol. 100 # 4 2010 Special Issue: 2010 Special Issue: Climate ChangeClimate Change
Pre-Columbian farmers of the Amazon were estimated 25 million, with 80% living within forest.
Amazonian Collapse & Europe’s Little Ice AgeAmazonian Collapse & Europe’s Little Ice Age
Significant Amazon forests were cleared and burned for agriculture before European arrival.Population pressure on forest increased steadily, peaking with European in arrival late 1600s.
Documented by Antarctic ice cores from 1500 to 1750—previously attributed only to decreased solar irradiance and increased volcanism.
Introduction of Old World diseases led to epidemics and unprecedented population crash.
Fire history throughout the lowlands, new high-resolution charcoal records, and population estimates support the idea that the Amazon went from net CO2 source to a CO2 decrease.
Post-Columbian carbon sequestration was significant to cause Europe’s Little Ice Age cooling.
Rapid population collapse was complete by 1650, with 95% of indigenous inhabitants dead.
Global Climate NegotiationsGlobal Climate NegotiationsIn Copenhagen, In Copenhagen, at the UN Framework Convention on Climate Change, at the UN Framework Convention on Climate Change, the President of Micronesia the President of Micronesia called for a called for a Pre-industrial COPre-industrial CO22 Target Target, , and large-scale investment in and large-scale investment in BiocharBiochar and methods to put and methods to put CarbonCarbon in soils. in soils.
No one can change the pastNo one can change the past
Thomas J. Goreau, PhDThomas J. Goreau, PhD
No other country responded. No other country responded.
President, Global Coral Reef AlliancePresident, Global Coral Reef AlliancePresident, Biorock International Corp.President, Biorock International Corp.Coordinator, UN Commission on Sustainable DevelopmentCoordinator, UN Commission on Sustainable DevelopmentRepresentative, Small Island Developing States PartnershipRepresentative, Small Island Developing States Partnership37 Pleasant Street, Cambridge, MA 0213937 Pleasant Street, Cambridge, MA 02139