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Carbon Sequestration

Eat your charcoal, child

Flore de Préneuf's picture

Many on this blog have written about the triple win of improved livelihoods, increased climate resilience and carbon capture. That vision of climate-smart agriculture and sustainable forest management is one of hope and necessity against a backdrop of food price volatility and climate extremes. Last week I was able to spend time studying the said “backdrop” – in the Eastern province of Kenya, where farmers who have last seen rain in March 2010 are cutting down trees to survive.

I spoke to farmers in Mboti, a community of about 100 families scattered in a world of thorny white bushes, red earth and isolated trees. Even in good times, they are brave people living on rain-fed agriculture in a region that gets much less average precipitation than Kenya's lush and populous highlands. They live on the edge – coexisting and sometimes competing with nomadic herders for salty water drawn from boreholes, one jerrycan at a time. 

But the farmers' endurance has been stretched to the limit. The heavy rains of November didn't materialize (it drizzled) and the April showers never did either. Priscilla Mwangangi, a 60 year-old widow, plowed her fields this spring hoping she could sow millet and sorghum, but instead spends her time minding a mound of charcoal which she feeds by chopping down acacia trees around her property. One big bag of charcoal sells for 400 Kenyan shillings – about $5.

The buzz around blue carbon

Marea E. Hatziolos's picture

Photo credit: J. TamelanderThe delegates and observers at the COP16 in Cancun are getting an earful about Blue Carbon—shorthand for atmospheric carbon sequestered in the earth’s coastal and nearshore environments. Oceans Day at Cancun will feature a session on Blue Carbon, and briefs, and blogs by ocean advocates are circulating on the net and at side events. The reason for the buzz is that coastal wetlands, including tidal salt marshes, estuaries and river deltas, mangroves and sea grass beds are highly efficient at taking up CO2 from the atmosphere and converting it into organic material—then storing it in the soil. In fact, the root systems and sediment layers which build up as this organic material is generated, broken down and deposited, are up to ten times more rich in carbon than the biomass above the surface.

 

This makes coastal wetlands even better at sequestering carbon than tropical forests. And, unlike their counterparts on land whose net growth peaks when the forest matures, wetland vegetation continues to grow and sequester carbon in the soil as long as sediments are deposited and the environment remains healthy. This is why Blue Carbon is being brought into the international dialogue on carbon emission offsets and the domain of REDD+ eligible activities. A statement, signed by 55 marine and environmental stakeholders from 19 countries has been presented to the COP for action.