Survival before safety for Delhi's poor as temperatures hit 45C BBC Tuk tuk driver Mohammad Umar had to miss a day of work because he could not cope with the heat On a scorching afternoon in one of Delhi's busiest markets, two different worlds exist side by side. One is inside brightly-lit, air-conditioned showrooms, where customers move slowly between racks of clothes, escaping the worst of the summer heat. The other is outside, under a blazing sun - where street vendors, fruit sellers, cycle-rickshaw drivers and ice-cream cart operators continue working through temperatures soaring above 40C. In the afternoon, even walking through the market feels exhausting. But for millions of informal workers across Delhi, staying out of the heat isn't an option. Nearly 90% of India's workforce is informal - most without contracts or job security, many dependent on outdoor work for daily wages.…