Temperature and sex ratios at birth / Jasmin Abdel Ghany (University of Oxford and Max PlanckInstitute for Demographic Research), Joshua Wilde (University of Oxford, Max Planck Institute or Demographic Research, Portland State University and IZA), Anna Dimitrova (University of California), Ridhi Kashyap (University of Oxford), Raya Muttarak (University of Bologna) ; IZA Institute of Labor Economics