The primary goal of the annual State of the Climate collection of articles is to document the weather and climate events in 2009 from around the world and put them into accurate historical perspective, with a particular focus on unusual or anomalous events. In total, 37 Essential Climate Variables were reported in 2009.

The present investigation deals with effect of structural composition of agroforestry system, number of woody perennial involved in the sytem and the management of practices plays a major role in influencing the biomass level, carbon storage, CO2 mitigation potential and total carbon sequestration in trees.