The World Health Organisation on Friday called on all nations to invest more in mental health, saying “the suffering is enormous” and has been made worse by the Covid pandemic. Even before Covid-19 almost a billion people were living with a mental disorder, the UN agency said in its largest review of global mental health in two decades. Then in the first year of the pandemic, rates of depression and anxiety went up by a quarter, even as scarce resources were deployed to fighting the virus. Just two percent of national health budgets and less than one percent of all international health aid goe…