Anthropogenic activities leading to the industrial revolution have contributed substantially to climate change by adding carbon dioxide (CO 2 ) into the atmosphere which has caused a gradual but significant increase in the atmospheric temperature through the years. Part of the efforts to mitigate CO 2 involves the capture and sequestration using microalgae. Efforts were made in KET's VG Vaze College to screen indigenously isolated thermophilic cyanobacteria for this purpose. High temperature

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... ptability (42ºC), high CO 2 tolerance (23.08%), reasonably high biomass production and easy harvesting made G. sulphureum a promising candidate for the CO 2 sequestration in the tropical climatic conditions. The present communication deals with the optimisation of productivity of G. sulphureum in a lab scale tubular photobioreactor by altering paramters such as light regime, CO 2 supplementation, and nitrate and carbon source optimisation. The baseline productivity was 0.035 g/Lday before optimisation. In case of the cumulatively optimised productivity, it increased to 0.094 g/Lday with the highest reported biomass concentration of 1.29 g/L.