Tag Archives: Science and Technology

How can negative emission technologies help us reduce global warming? – Carbon sequestration : natural and artificial

Carbon sequestration is the process of capture of CO2 from the atmosphere, and its long-term storage in plants (through photosynthesis), soil, geologic formations (as calcium carbonate), and ocean. This process can be physical, chemical, or biological (biosequestration) in nature.

Oceans are the largest sink for atmospheric carbon. Carbon dioxide from the atmosphere dissolves into surface water of ocean, where it is utilised by marine plants (phytoplanktons) that turn it into organic matter through the process of photosynthesis. Many organisms in ocean convert CO2 into calcium carbonate – which becomes the building material for their shells and skeletons.

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Nuclear Power in India – history and complete scenario – 2008 NSG waiver – 2005 India-US Civil Nuclear Agreement

History and evolution of nuclear energy scenario in India

Post-independence India envisioned nuclear energy as a way to reduce India’s dependence on oil imports, and achieve energy security. The three-stage nuclear power programme was a strategy formulated by Homi Bhabha in the 1950s to secure the country’s long term energy independence, through the use of uranium and thorium reserves found in the monazite sands of coastal regions of South India.

Apsara (1956) was India’s and Asia’s first nuclear reactor, located at Bhabha Atomic Research Centre (BARC), Mumbai. First nuclear power plant of India was a Boiling Water Reactor set up at Tarapur, Maharashtra, imported from USA under an agreement in 1962.

India’s nuclear power programme progressed little between 1970s to 2000s due to international isolation and non-support from international technological powers after India conducted nuclear tests Pokhran I (1974) and then Pokhran II (1998). Nuclear power is still underdeveloped in India. Nuclear energy constitutes only about 2% of the energy mixture of India, while coal continues to be the major source of power (at around 60%).

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