The COVID-19 pandemic will result in "most definite and substantial increase" in child labour, child trafficking and slavery across the world, warned India's Nobel Laureate Kailash Satyarthi as he prepares to send an SOS tomoroow in a global event called 'Laureates and Leaders for Children Summit 2020' attended by the global who's who including WHO director-general Tedros Adhanom Ghebreyesus and the Dalai Lama along with prime ministers and presidents of different nations