12. The World Wildlife
Fund says half of
the topsoil on the
earth has been lost
in just the last 150
years from farming,
deforestation,
overgrazing, and
use of
agrochemicals.
13. Even worse, during that same
period, humans have added
more CO2 to the atmosphere.
21. Managing soils and crops to
maximize C storage is known as
CARBON
FARMING.
22. Plants store carbon in leaves,
stems, and roots. After harvest,
when
stubble dies and
roots decay, some
of that carbon is stored
in the soil.
23. Since perennials tend to have larger root
systems, their potential for deep-soil
carbon storage is greater.
Up to 3 feet
As much as 10 feet (and more)
ANNUAL PERENNIAL
24. Studies show as little as a 1.3 cm (about
a half inch) topdressing of compost can
add "substantial" increases in carbon
storage, too.
30. By one estimate, converting just 5
percent of land (about the size of Egypt)
to plants bred for carbon storage could
capture ~50 percent of current global
CO2 emissions.
31. The trick is to switch back from
annual to perennial grains while
maintaining acceptable yields,
giving farmers an economic
incentive to convert acreage.
32. One of the more successful research
projects is the development of a new
perennial wheat grain, Kernza®.
33. It is already being used
commercially on a small
scale.
36. Reuters says better soil
management could boost
carbon storage by a factor equal
to emissions from all global
transport.
37. The amount of compost required for a
½-inch pre-plant compost application
could sequester about 20% of U.S.
carbon pollution if annual grain acres
were converted to perennial varieties.