WASHINGTON/MIAMI (Reuters) - Hurricane Gustav weakened to a category three storm as it moved through the oil-rich Gulf of Mexico on Sunday after hitting Cuba.

Source:Hurricane Gustav weakens in Gulf of Mexico

CHICAGO (Reuters) - The brains of flies are wired to avoid the swatter, U.S. researchers said on Thursday.

Source:Why it's so hard to swat a fly

Climate protesters scaled security fences to enter the site of a coal-fired power station in southeast England on Saturday but German firm E.ON, which runs the plant, said output had not been disrupted.

The protesters oppose plans for two new coal units at the facility, which will also be operated by E.ON.

Source:UK climate protesters fail to stop E.ON output

Scientists have found that air pollution from East Asia contains an abundance of ‘brown carbon’ particles and say that atmospheric models need updating to incorporate their effect.

Current climate models take into account two types of aerosol carbon — organic carbon and black carbon — that arise from the burning of fossil fuels or biomass.

Source:Current climate models 'ignoring brown carbon'

China kicked off the last leg of its Olympic torch relay on Friday under hazy skies and with a threat of rain complicating plans for the opening ceremony.

Beijing has spent heavily to curb pollution, clearing over half the city’s cars from its streets and closing dozens of factories, but the air quality for the start of the Games is expected to be only just within the guidelines for safe levels.

Source:Torch relay enters final leg under hazy skies