Global warming and climate change : issues and challenges ; [proceeding volume of National Seminar on Global Warming and Climate Change: Issues and Challenges in 21st Century India held on 20th & 21st November 2010] Papers presented at the National Seminar on Global Warming and Climate Change : Issues and Challenges in 21st Century India held at Suri Vidyasagar College Birbhum West Bengal during 20 21 November 2010