Dr. Eunice Lo on Her Study About the Impacts of Climate Change on Heat Deaths in US Cities June 13, 2019 / activist360 / Leave a comment Limiting warming to 1.5C could prevent ‘thousands’ of heat deaths in US cities. Holding global temperature rise to 1.5C above pre-industrial levels, rather than 2C or 3C, could help prevent thousands of deaths in US cities during heatwaves, a new study says.