PATNA, Jan. 18 -- With just a day left for the proposed formation of 16,351-km-long human chain involving an estimated 4.27 crore of people across Bihar to promote the cause of environment, RJD chief Lalu Prasad has accused chief minister Nitish Kumar of resorting to "gross extravagance to shine his image through human chain", prompting Kumar's party in hitting back saying the former CM was only interested in "property chain"....