COVID-19 academic communication academic conferences academic flying academic institutions air travel bic Book Industry Communication::J Society & social sciences::JF Society & culture: general::JFD Media studies bic Book Industry Communication::J Society & social sciences::JH Sociology & anthropology::JHB Sociology bic Book Industry Communication::J Society & social sciences::JN Education bic Book Industry Communication::R Earth sciences, geography, environment, planning::RG Geography::RGC Human geography carbon footprint climate change communication technology mobilities new mobilities paradigm open access sustainability university administrators