Agricultural Carbon Sinks for climate change mitigation

A carbon sink is a natural or artificial reservoir that gathers and stores carbon containing chemical compounds for an indefinite period. Agricultural carbon sinks also called agriculture carbon sequesters refers to agricultural farms, ranches and forests which absorb CO₂, the most important global warming gas emitted by human activities. According to the greenhouse effect theory, the discharge into the atmosphere of large quantities of carbon dioxide (CO₂) and other green house gases eventually warms the planet causing climate change. This is due to destruction of the ozone layer which whose function is to reduce the strength of the radiation or sun rays reaching the earth.

Increased concentration of CO2 and other greenhouse gases in the atmosphere has led to global warming. Average global temperatures increased by about 1 degree in the 20th century, contributing to the thawing of the permafrost, rising ocean levels and extreme weather according to scientist. Currently there is increased global concern of greenhouse gas emissions and scientists are researching on ways to limit the amount of CO₂ entering the atmosphere; Therefore there is a global drive to limit CO₂ emissions into the atmosphere through Carbon Capture and Storage (CCS) technologies, in order to mitigate climate change. Carbon sequestration is the process through which agricultural and forestry practices remove carbon dioxide (CO₂) from the atmosphere and deposit it in a reservoir.Agriculture  Carbon sequestration activities can help to prevent global climate change by enhancing carbon storage in soils and trees, preserving existing soil and tree carbon, and by reducing emissions of CO₂, methane (CH₄) and nitrous oxide (N₂O).

In order to comprehend CO₂ emissions from the soil, it is important to understand the carbon cycle in farm systems.  Normally CO₂ in the atmosphere is absorbed by plants, and it is transformed into carbohydrates, cellulose and other sugars, during the process of photosynthesis.  The plant uses some of the carbon compounds to meet its energy needs and converts the rest back into CO₂.  Some of the carbon remaining in the plant is then removed from the system when the plant is harvested; the rest ends up in the ground and is transformed into CO₂ again by microbes in the soil.  This cycle is identical in all crop systems, but the quantities of CO₂ involved vary depending on climate, soils and type of plant.  The cycle is slightly more complex on farms where animals are raised because instead of being removed from the system, a considerable amount of the plant matter is used as bedding or animal feed.  Then carbon is released in various ways such as removal by the animals in the form of CO₂, removal in form of animal products (e.g. meat), and a significant amount is returned to the ground in the form of manure.

The soil is a great carbon sink in form of organic matter and various farming practices enhance carbon sequestration in the soil. Therefore creation of a soil carbon sink calls for adoption of land management practices that increase the organic carbon content of the soil. This includes:-

·        Use of minimum tillage , common in conservation agriculture, which minimizes soil disturbance reducing the amount of CO₂ released into the atmosphere ;

·        Cover cropping as temporary cover between seasons;

·        Crop rotation and intercropping;

·        Soil conservation using contour terraces or vegetative strips;

·        Rotation grazing and high-intensity short-term grazing which involves concentrating livestock in small paddocks for days at a time so they graze lightly but evenly which encourages roots to grow deeper into the soil;

·        Planting of shrubs and trees as windbreaks;

·        Use of farmyard and compost manure to increase soil organic matter;

·        Conversion of marginal farmland to perennial grasses or trees;

Therefore Soil carbon sequestration is a good way of reducing agricultural greenhouse gas emissions, and creation of a market for reducing carbon emissions would enable farmers to benefit economically from the process. Use of the above land management practices enables the soil to capture more CO₂ than it emits; in effect CO₂ is removed from the atmosphere and stored in the soil. As matter of fact, soil Carbon sequestration is a multi- purpose strategy with several co-benefits which include:-

1.      Reduced atmospheric CO2 and climate change mitigation;

2.      Improved agricultural productivity;

3.      Food security improvement;

4.      Increased farm income;

5.      Improved water conservation;

6.      Reduced soil erosion;

7.      Increased farm profitability;

8.      Environmental conservation;

9.      Poverty reduction;

Forests are carbon stores or carbon sinks when they are increasing in density or area. Growing trees sequester large amounts of carbon dioxide from the atmosphere through the process of photosynthesis. The carbon is used to build the plant and the oxygen is released back into the atmosphere. Forest fires and deforestation releases absorbed carbon back into the atmosphere, due to rapidly increased oxidation of soil organic carbon. 

Youth and Climate Change for livelihood sustainability

A large percentage of the world’s population today comprises of young people with about 2.2 billion people being less than 18 years old. In this era of global climate change, 85% of these 2.2 billion young people are a resource that can be used to change the society towards reduction of climate change for sustainability. Furthermore, the young people can play a key role in dealing with all the difficulties that are facing humanity.

One thing that sets the young people apart from the rest of the population is their enthusiasm, imagination, talent and energy. The young people are more likely to get involved in local actions, play the role of effective communicators within their communities and participate in international actions against climate change and un-sustainability. For this reason FAO and other international organizations have been working together to come up with activities and mechanisms that enhance awareness, and access to relevant knowledge and information among the youth. The main aim of these efforts is to encourage participation of young people in actions relating to environmental sustainability and social development issues such as global warming.

The Red Cross and Red Crescent has for a long time been on the forefront in involving the young people in dealing with the humanitarian consequences of global warming for sustainability.  For instance in 2009, the Red Cross organized the Youth on the Move convention in Solferino which had climate change as one of the main themes. During the convention, a large number of youth and teenagers received training from climate change experts encouraging livelihoods sustainability. Since the conclusion of this convention, there has been evidence of increased youth involvement in activities relating to climate change and sustainability.

In strategy 2020, the Red Cross reaffirms that it is committed to address climate change impacts on human livelihoods especially the young people who make up the larger proportion of the population and the hope of tomorrow. Strategic aim of strategy 2020 is geared towards ensuring that the public adopts an environmentally sustainable lifestyle. This will lead to reduction of green house gases emissions. Similarly, in Strategy 2020, the IFRC reaffirms its commitment to ensuring that youth continue to volunteer and develop strong Red Cross and Red Crescent societies.  This will build a strong culture of voluntary service among the youth encouraging sustainability and youth participation in community and national affairs.