PAU scientists warn that climatic changes may take a toll on various crops grown in the state. What is worrying Punjab Agricultural University (PAU), Ludhiana, is that the rise in the average minimum night temperature and the humidity level may not only harm agriculture, but also the ecosystem in the state. Senior officials today made a presentation in this regard before the university board comprising senior officials of the state agriculture, horticulture and other departments. Financial Commissioner (Development) Navreet Singh Kang was also present at the presentation.