For decades, climate scientists have worked to identify and measure key substances — notably greenhouse gases and aerosol particles — that affect Earth’s climate. And they’ve been aided by ever more sophisticated computer models that make estimating the relative impact of each type of pollutant more reliable.
Yet the complexity of nature — and the models [...]

Researchers in China have documented what they describe as the rapid retreat of glaciers on the Tibetan Plateau, the source of many of the subcontinent’s rivers, and warned of the dangers to the water supply and livelihoods of millions in India, downstream of these rivers.
Research teams from Greenpeace China and Green Earth Volunteers, a Beijing-based [...]