"A controversial American businessman dumped around 100 tonnes of iron sulphate into the Pacific Ocean as part of a geoengineering scheme off the west coast of Canada in July, a Guardian investigation can reveal. Lawyers, environmentalists and civil society groups are calling it a 'blatant violation' of two international moratoria and the news is likely to spark outrage at a United Nations environmental summit taking place in India this week."

Scientists have disagreed about whether global warming is causing hurricanes to be more frequent and powerful. Now a study using a new measuring technique, published in a major peer-reviewed journal, has produced a longer historical data record that authors say shows the connection.

"Last month tied for the warmest September in the global modern record, scientists at the U.S. government's National Oceanic and Atmospheric Administration reported on Monday."

Next year California will put into effect a "cap and trade" system to control greenhouse gas emissions.

A lawyer for a climate-change-denial group seeking records from scientist Michael Mann apparently failed to get advance permission from his then-employer EPA to work on the case pro bono.

"Julia Whitty is on a three-week-long journey aboard the the US Coast Guard icebreaker Healy, following a team of scientists who are investigating how a changing climate might be affecting the chemistry of ocean and atmosphere in the Arctic."

"Climate change is expected to drop water levels in the Great Lakes, experts said Wednesday. Levels could drop anywhere from a few inches to several feet as water evaporates in the drought conditions."

"Mitt Romney's campaign opened an attack on the Obama administration's climate change policies yesterday by warning farmers that greenhouse gas regulations could hike fuel prices. He also suggested that President Obama might pursue a carbon-pinching cap-and-trade program if he wins the election."

"Nearly three-quarters of Americans say global warming influences U.S. weather and made this year's record-hot summer worse, a survey said on Tuesday."