Large cities can affect the weather as far as 1,000 miles away, say scientists, warming some areas and cooling others.
The Little Ice Age - the centuries-long period of cooling that began in the Middle Ages - appears to have been triggered by four massive volcanic eruptions in the tropics.
The deep oceans can absorb enough heat to mask the effect of global warming for a decade at a time, say scientists at the National Center for Atmospheric Research (NCAR).
A three-year series of research flights from the Arctic to the Antarctic comes to an end this week, completing an unprecedented survey of greenhouse gases in the atmosphere.
If climate change continues, summer sea ice in the Arctic could disappear altogether - but in the meantime Arctic ice could temporarily stabilize or even increase.
Areas around airports experience more rain and snow, say researchers, as planes trigger precipitation by flying through clouds.
The US may be set for severe and prolonged droughts in the coming decades, a new government study has found.
A new study from the National Center for Atmospheric Research and other bodies aims to quantify the effects of population growth on carbon dioxide emissions, and concludes that it could make a big difference.
A new computer model has indicated that the parting of the Red Sea could really have taken place - if the winds were right.
Strange circular holes in clouds which have frequently led to speculation about UFOs are caused by nothing more mysterious than aircraft, a study has shown - and they can cause several inches of snow or rain too.
Half the heat believed to have built up on Earth in recent years can't be accounted for.
The Asian monsoon is sending pollutants up to stratospheric heights and spreading them right across the globe, says the National Center for Atmospheric Research (NCAR).