Not just coronavirus. Another and much more ancient threat could also come from China: about twenty mysterious viruses, trapped for thousands of years in a Tibetan glacier, which risk being freed from the melting of the ice caused by global warming.

source: http://www.ansa.it/canale_scienza_tecnica/notizie/biotech/2020/01/28/-cina-scoperti-antichi-virus-intrappolati-nei-ghiacci-_b4436bbc-a771-4fda-8c6e-e71c0988eb17.html