Alaska experienced its warmest month ever in July, with the coastline barren of sea ice. Climate scientists warn that without a significant reduction in greenhouse gas emissions, extreme heatwaves will continue to increase around the world. The Arctic is heating up at twice the average rate of the rest of the world, with melting sea ice causing further warming. The melting of glaciers in Greenland is a leading contributor to sea level rise, which imperils coastal cities around the world. The upcoming UN climate summit in New York in September will discuss the consequences of global heating.