The spring and summer melt season is officially on for Arctic sea ice, and it’s not off to a good start. The 2015 melt season will start with a record low maximum ice extent. According to scientists at the National Snow and Ice Data Center, sea ice extent was 425,000 square miles below the 1981-2010 average. That's the equivalent of 1.6 times

Since at least 1979, Arctic sea ice has generally been on a downward slope, trending 4.5 percent lower per decade overall and 13.7 percent lower per decade during the September summer minimum. In fact, the average September Arctic sea ice extent is down almost 1 million square miles from where it was about 30 years ago. There’s no reason to think

Since the advent of modern recordkeeping in 1880, the global average temperature has risen 1.6°F. The trend is one of the hallmarks of global warming and tightly tied with the rise in human CO2 emissions. Warming has accelerated since the first Earth Day in 1970. The global average temperature has risen by about 0.3°F per decade since then.

Coastal American cities are sinking into saturated new realities, new analysis has confirmed. Sea level rise has given a boost to high tides, which are regularly overtopping streets, floorboards and other low-lying areas that had long existed in relatively dehydrated harmony with nearby waterfronts — a trend projected to worsen sharply in the comin