NEW DELHI: The Supreme Court on Thursday expressed concern over landslides and floods in various states, observing that the large number of logs seen floating in floodwaters suggested large-scale tree felling in the upper reaches of the hills.A two-judge bench comprising Chief Justice of India (CJI) BR Gavai and Justice K Vinod Chandran issued notices to the Centre and the governments of Himachal Pradesh, Punjab and Uttarakhand, directing them to submit their responses within two weeks.“This is very serious and prima facie indicates large-scale felling of trees in the hills,” CJI Gavai told Solicitor General Tushar Mehta, who appeared for the Centre. “Get in touch with the relevant authorities and ascertain the reasons for this.”Mehta acknowledged the gravity of the issue and said he would contact the Environment Ministry secretary to gather the details.“We have interfered with nature so much that it is now giving back,” Mehta remarked, with the CJI agreeing with him.