A seemingly endless sea of ghostly white corals more and more often replaces a once-thriving reef. The image of mass coral bleaching is a striking portrait of how climate change is threatening marine ecosystems' survival and the millions of people they support. Coral bleaching occurs... click to read more

Earth's climate over most of the last million years was much colder than the present. Massive ice sheets repeatedly covered large parts of North America and Eurasia. Periodically, these ice sheets melt when average global temperatures climb sharply to levels of today. Scientists have long... click to read more

Roughly one in five of us lives in a coastal area at risk from tropical cyclones. For decades investments in early warning systems have allowed us to move out of harm's way, reducing the number of lives lost. Despite this progress, we remain unsuccessful at... click to read more

The COVID-19 pandemic highlights the fragility of global supply chains and underscores the risks of supply disruptions during a crisis. This is only the most recent reminder of such risks to economies that are heavily reliant on imported goods and materials, with supply chain disruptions... click to read more

Glaciers around the world are melting faster than in any previous decade since measurements began. Glaciers form when snow accumulates over many years and compresses into ice. Glaciers accumulate snow in the winter, and then melt ice in the summer. Cold temperatures, more snow, or both,... click to read more